As filed with the Securities and                   Registration No. _________
Exchange Commission on May 16, 2001

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                               THERMOGENESIS CORP.
             (Exact name of the Company as specified in its charter)


            Delaware                                    94-3018487
            --------                                    ----------
(State or other jurisdiction or                     (I.R.S. Employer
incorporation or organization)                    Identification Number)


                              3146 Gold Camp Drive
                        Rancho Cordova, California 95670
                                 (916) 858-5100
                   (Address, including zip code, and telephone
                         number, including area code, of
                    registrant's principal executive offices)

                                Philip H. Coelho
                             Chief Executive Officer
                               THERMOGENESIS CORP.
                              3146 Gold Camp Drive
                            Rancho Cordova, CA 95670
                                 (916) 858-5100
       (Name, address, including zip code, and telephone number, including
                        area code, of agent for service)

                                   Copies to:

                              David C. Adams, Esq.
                              Bartel Eng & Schroder
                          300 Capitol Mall, Suite 1100
                              Sacramento, CA 95814
                                 (916) 442-0400

Approximate date of commencement of the proposed sale to the public:  As soon as
practicable, and from time to time after the effective date of this Registration
Statement.

If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ]

If this Form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

If delivery  of the  Prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box. [ ]




                         CALCULATION OF REGISTRATION FEE



                                                                                             
                                                                                          Proposed
                                                                     Proposed              maximum
                                                                      maximum             aggregate         Amount of
Title of each class of securities to           Amount to be       offering price       offering price     registration
be registered                                   registered           per share                                 fee
===========================================  =================  ===================  =================== ===============

- -------------------------------------------  -----------------  -------------------  ------------------- ---------------
Common Stock                                     3,944,047           $  2.41(1)         $9,505,153.27       $2,376.29
- -------------------------------------------  -----------------  -------------------  ------------------- ---------------

- -------------------------------------------  -----------------  -------------------  ------------------- ---------------
Common Stock Underlying Warrants                   788,809(2)        $  2.88(3)         $2,271,769.92       $  567.95

Common Stock Underlying Warrants                   415,000(2)        $  1.625(3)        $  674,375.00       $  168.60


- -------------------------------------------  -----------------  -------------------  ------------------- ---------------

- -------------------------------------------  -----------------  -------------------  ------------------- ---------------
Total                                            5,147,856                                                  $3,112.84
===========================================  =================  ===================  =================== ===============


(1) Calculated in accordance  with Rule 457(c) of the Securities Act of 1933, as
amended  ("Securities  Act").  Estimated for the sole purpose of calculating the
registration  fee and based upon the average of the high and low price per share
of our common stock on May 15, 2001, as reported on the Nasdaq Small Cap Market.

(2) Represents the number of shares of common stock offered for resale following
the exercise of warrants.

(3) Calculated in accordance with Rule 457(g) of the Securities Act.

The registrant hereby amends this  registration  statement on such date or dates
as may be necessary to delay its effective date until the registrant  shall file
a further amendment which specifically  states that this registration  statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities  Act of  1933  or  until  the  registration  statement  shall  become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.



Subject to Completion dated May 16, 2001                             PROSPECTUS


                                5,147,856 Shares

                               THERMOGENESIS CORP.

                                  Common Stock


     All of the shares of common stock of THERMOGENESIS  CORP. offered are being
sold by the selling stockholders listed in this Prospectus.  Of the shares being
sold by the selling stockholders,  up to 1,203,809 shares may be resold upon the
exercise of outstanding warrants. The common stock and warrants were issued in a
private debt  financing in December  2000 and a private  placement  completed in
April 2001. We will not receive any proceeds from the resale of any common stock
by the selling stockholders.

     Our common stock is traded and listed on The Nasdaq SmallCap Market,  under
the symbol  "KOOL." On May 15, 2001, the last reported sale price for the common
stock was $2.41. There is no market for the warrants.



          INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                          SEE "RISK FACTORS" AT PAGE 4.
                         -------------------------------

NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THE COMMON STOCK OR DETERMINED IF THIS
PROSPECTUS  IS TRUTHFUL OR  COMPLETE.  ANY  REPRESENTATION  TO THE CONTRARY IS A
CRIMINAL OFFENSE.

The  information in this  prospectus is not complete and may be changed.  We may
not sell  these  securities  until the  registration  statement  filed  with the
Securities and Exchange Commission becomes effective.  This prospectus is not an
offer to sell these  securities  and we are not soliciting an offer to buy these
securities  in any state  where the offer or sale is not  permitted  or would be
unlawful prior to registration or qualification under the securities laws of any
such state.





                  The date of this Prospectus is _____________


 2
                               PROSPECTUS SUMMARY

     This  Prospectus  contains or  incorporates  "forward-looking  statements,"
which include statements about our business strategy,  our growth strategy,  our
product  development  and  marketing  efforts,  and  anticipated  trends  in our
business,   which  are  not  historical  facts.  We  may  also  make  additional
forward-looking  statements  from time to time in filings  that we make with the
Securities and Exchange Commission.  When we use words like "believe," "expect,"
"anticipate," "project," and similar expressions, this should alert you that the
statement is  forward-looking.  Forward-looking  statements speak only as of the
date made,  based  largely on  expectations.  These  expectations  are generally
subject  to a number  of  risks  and  uncertainties,  some of  which  cannot  be
predicted or  quantified,  and which are beyond our control.  Future  events and
actual results may differ materially from the anticipated  results expressed in,
contemplated  by, or underlying our  forward-looking  statements.  Statements in
this  Prospectus,   and  in  documents   incorporated  by  reference  into  this
Prospectus,  including  those set forth in the caption "Risk  Factors"  describe
factors,  among others, that could contribute to or cause differences.  In light
of these  risks  and  uncertainties,  we can not give  any  assurances  that the
forward-looking  information  will in fact  transpire or prove to be accurate in
the future.


Our Business

     We are a leading developer and manufacturer of micro-manufacturing  systems
designed to harvest biopharmaceutical drugs from blood.  Biopharmaceutical drugs
utilize  the body's  naturally  occurring  proteins,  enzymes,  growth  factors,
hormones  and  cells to treat  human  diseases.  Our  technology  platforms  are
designed to micro-manufacture  biopharmaceutical drugs from a single donation of
blood, in contrast to the manufacture of  biopharmaceutical  drugs using "pools"
of blood from thousands of donors, or by using expensive technology.

Our Strategy

     Our strategy to take advantage of our market opportunity includes:

o    Utilizing   our   expertise   in   the   areas   of   thermodynamics    and
     cryopreservation;

o    Developing new products through platform designs to build new products with
     only a small incremental research and development investment;

o    Become  the leader in the  design,  development,  manufacture,  and sale of
     medical devices which produce biopharmaceutical drugs from an autologous or
     directed  single donor unit of blood to reduce or  eliminate  contamination
     and risk of infection to the recipient; and

o    Develop  disposable  products  that are used  with  our  platform  designed
     products to provide a recurrent stream of revenue.

Risk Factors

For a  discussion  of  considerations  relevant to an  investment  in our common
stock, see the section entitled "RISK FACTORS" beginning on page 4.


 3

The Offering

Common Stock Outstanding Before the Offering....................... ..31,354,576
Common Stock Offered by Selling Stockholders (a).......................1,203,809
Common Stock Outstanding After the Offering (a).......................32,558,385

Use of Proceeds                     We will not  receive any  proceeds  from the
                                    resale  of  common  shares  by  the  Selling
                                    Stockholders.  We will receive  proceeds  if
                                    certain outstanding warrants are  exercised.
                                    Any proceeds from the  exercise of  warrants
                                    will be used for working capital.

Nasdaq SmallCap Symbol......................................................KOOL

(a) Assumes  that  warrant  holders have  exercised  their  warrants to purchase
1,203,809  shares  of common  stock in the  aggregate.  The  number of shares of
common  stock that is being  registered  by this  registration  statement is the
total  number of shares of common  stock and shares of common  stock that may be
issued upon the exercise of warrants.

 4
                                  RISK FACTORS


     An  investment  in our common stock  involves a number of very  significant
risks.  Because  of  these  risks,  only  persons  able to bear  the risk of and
withstand the loss of their entire investment should invest in our common stock.
Prospective  investors  should also  consider  the  following  before  making an
investment decision.

     We Have  Incurred  Net Losses  Since Our  Inception  and  Expect  Losses to
Continue.  Except for net income of $11,246  for fiscal  1994,  we have not been
profitable since our inception.  For the fiscal year ended June 30, 2000, we had
a net loss of  $5,818,000,  and an  accumulated  deficit  at June 30,  2000,  of
$37,339,000.  For the nine  months  ended March 31,  2001,  we had a net loss of
$3,811,000.  The report of independent  auditors on our June 30, 2000, financial
statements  includes an explanatory  paragraph  indicating  there is substantial
doubt  about  our  ability  to  continue  as a going  concern.  Although  we are
executing on our business plan to market launch new products,  continuing losses
will impair our ability to fully meet our  objectives  for new product sales and
will further impair our ability to meet continuing  operating expenses.  Lack of
operating  funds may result in staff  reductions  and  curtailment  of  clinical
trials  currently  planned.  See Risk Factor entitled "If We Are Unable to Raise
Funds Our Growth May Be Adversely Affected" below.

     If We Are  Unable to Raise  Funds Our  Growth  May Be  Adversely  Affected.
Historically,  we have had to seek  capital  and to  develop  our  products  for
operations  due to lack of  revenues.  Based on  proceeds  of  approximately  $5
million  from our recent  private  placement  (See "Recent  Financing  and Other
Recent Events" on page 11), we believe we will have  sufficient  working capital
for the next twelve  months  operations.  However,  if actual  sales do not meet
expectations,  or  marketing,  production  and  clinical  trial  costs  increase
significantly,  we will need additional  financing to complete and implement our
long-term   business   objectives.   Further,   delays  in  obtaining   required
governmental  clearances  for,  or  additional  testing  requirements  prior to,
marketing our new products will result in decreased revenues and increased costs
that may require us to seek additional  financing.  In the event that there is a
cash shortage and we are unable to obtain a debt  financing,  additional  equity
financing  will be  required.  Seeking  additional  financing  would  dilute the
ownership of existing stockholders.

     We Have Limited Testing Data and Must Complete Further Testing Successfully
in Order To Obtain  Regulatory  Permission  to Initiate  Human  Clinical  Trials
Required to Market our CryoSeal  Fibrin  Sealant  (FS)  System.  The Company has
completed  certain in vitro and in vivo testing of its  CryoSeal FS System,  and
further  clinical  studies  are to begin in the near  future  in  Italy,  Japan,
Canada,  and the United  States  with the  CryoSeal  FS  System.  Other in vitro
studies have occurred with the BioArchive Stem Cell System.  While these studies
provide a basis to achieve  regulatory  permission  to promote these systems for
some of the indications  that management  believes can be achieved,  they do not
provide a basis to achieve all of the indications. Further clinical studies must
be  performed.  There  can be no  assurance  that the  clinical  studies  can be
successfully  completed within the Company's  expected time frame and budget, or
that the  Company's  products  will prove  effective  in the  required  clinical
trials. If the Company is unable to conclude successfully the clinical trials of
its products in development,  the Company's  business,  financial  condition and
results of operation could be adversely affected.

     Our  Failure to  Develop  New  Products  Will  Adversely  Effect Our Future
Growth.  Historically,  substantially  all of our sales have been from  products
related to the freezing, thawing, and

 5

storing of blood  plasma.  Because we expect  this  segment of the blood  plasma
market to have limited growth,  new products for the  biotechnology  market will
have to be  successfully  developed  and  marketed  for  future  growth.  We are
currently  focusing on developing and marketing novel blood  processing  systems
such as the CryoSeal FS System for the  automated  production  of  autologous or
allogeneic blood components used as a fibrin sealant. Although this product uses
technology related to our core research, it also represents a departure from our
core blood  plasma  business.  Further,  although we have had  discussions  with
experts in areas of application for these products,  these products are still in
their  development  and/or initial market phase.  No assurance can be given that
all of these potential products can be successfully developed, and if developed,
that a market will also develop for them.

     If We Fail to  Maintain  Our Nasdaq  Listing,  Liquidity  of the  Company's
Stockholders  Will Be  Adversely  Affected.  Our common stock is listed with the
Nasdaq  SmallCap  Market  which  has  established  certain  maintenance  listing
requirements  that must be satisfied  in order for a company's  shares of common
stock to continue  to be listed.  Currently,  our common  stock meets the Nasdaq
Small Cap Market maintenance  listing  requirements.  However, if we continue to
incur losses,  this may affect our ability,  among other things, to meet the net
tangible  assets of $2 million  requirement or minimum Bid Price of $1 per share
listing  requirement as set by the Nasdaq SmallCap Market. We cannot assure that
we will always be able to meet the Nasdaq SmallCap  Market listing  requirements
in the future.  Failure to meet the Nasdaq SmallCap Market listing  requirements
could  result in the  delisting  of our common  stock  from the Nasdaq  SmallCap
Market which may adversely affect the liquidity of our shares.

     Our  Business  is  Heavily  Regulated,  Resulting  in  Increased  Costs  of
Operations  and  Delays in  Product  Sales.  Most of our  products  require  FDA
clearance to sell in the U.S. and require clearance from comparable  agencies to
sell our products in foreign  countries.  These clearances may limit the U.S. or
foreign  market in which our products may be sold or  circumscribe  applications
for U.S. or foreign  markets in which our products may be sold.  The majority of
our products  related to freezing blood components are currently exempt from the
requirement to file a 510(k) pre-market  application and our CryoSeal AHF System
received  clearance from the FDA in February 1999.  These products are currently
marketed and sold worldwide.  Further,  our products must be manufactured  under
principals of our quality system for continued Certificate European (CE) marking
that allows our products to be marketed and sold in Europe, which are similar to
the quality  system  regulations  of both the FDA and  California  Department of
Health. Failure to comply with those quality system requirements and regulations
may subject the Company to delays in production while it corrects any deficiency
found by  either  the FDA or the  State of  California  during  any audit of our
quality  system.  With  limited  working  capital  and  resources,  there  is no
assurance  that we will  not be  found  to be out of  compliance,  resulting  in
warning letters or, in worst case,  temporary shut down of  manufacturing  while
the non-conformances are rectified.

     Influence By the  Government and Insurance  Companies May Adversely  Impact
Sales of Our  Products.  Our business may be  materially  affected by continuing
efforts by government,  and third party payors such as medicare,  medicaid,  and
private health insurance plans, to reduce the costs of healthcare.  For example,
in certain foreign markets the pricing and profit margins of certain  healthcare
products are subject to government  controls.  In the U.S., we expect that there
will continue to be a number of federal and state proposals to implement similar
government control. In addition, increasing emphasis on managed care in the U.S.
will  continue to place  pressure on the pricing of  healthcare  products.  As a
result,  continuing  effort to  contain  healthcare  costs may result in reduced
sales or price  reductions  for our  products.  To date, we are not aware of any
direct impact on our pricing or product sales due to such efforts by governments

 6

to contain  healthcare  costs,  and we do not anticipate any immediate impact in
the near future.

     Our  Inability to Protect Our Patents,  Trademarks,  and Other  Proprietary
Rights Could  Adversely  Impact Our  Competitive  Position.  We believe that our
patents,  trademarks,  and other proprietary rights are important to our success
and our competitive  position.  Accordingly,  we devote substantial resources to
the  establishment  and protection of our patents,  trademarks,  and proprietary
rights.  We currently  hold patents for products,  and have patents  pending for
additional products that we market or intend to market.  However, our actions to
establish and protect our patents,  trademarks, and other proprietary rights may
be  inadequate  to prevent  imitation  of our  products  by others or to prevent
others from claiming  violations of their  trademarks and proprietary  rights by
us. If our products are challenged as infringing  upon patents of other parties,
we will be required to modify the design of the  product,  obtain a license,  or
litigate the issue, all of which may have an adverse business effect on us.

     Failure to Protect Our Trade Secrets May Assist Our Competitors. We protect
our trade secrets and proprietary  know-how for our products by various methods,
including the use of  confidentiality  agreements with employees,  vendors,  and
customers.  However,  such methods may not provide complete protection and there
can be no assurance that others will not obtain our know-how,  or  independently
develop  the  same or  similar  technology.  We  prepare  and  file  for  patent
protection on aspects of our technology  which we think will be integrated  into
final products early in design phases, thereby limiting the potential risks.

     Competition  in Our Industry is Intense and Will Likely  Involve  Companies
With Greater Resources Than We Have. We hope to develop a competitive  advantage
in the medical applications of our products, but there are many competitors that
are  substantially  larger  and who  possess  greater  financial  resources  and
personnel than we have. Our current principal market is the users of ultra-rapid
blood plasma freezing and thawing equipment.  There are four companies that sell
freezers  to the blood  plasma  freezing  industry  which are larger and possess
greater  financial and other  resources than we do. The CryoSeal System may face
competition  from major plasma  fractionaters  that  currently  sell fibrin glue
sourced  from  pooled  plasma  outside the U.S.  With  regard to the  BioArchive
System,  numerous larger and  better-financed  medical device  manufacturers may
choose to enter this market as it develops.

     We Have a Limited  Marketing  and Sales  Force for New  Products  Which May
Delay Our Goal of Increased Sales Levels. We currently sell our existing medical
devices through a direct sales and marketing force, and our foreign distribution
network.  Although we have entered into  geographically  exclusive  distribution
agreements for the area of the two new platform products and we continue to seek
strategic  partners,  there are no assurances  that the  distributors  will sell
significant numbers of the systems.

     Our Lack of Production  Experience May Delay Producing Our New Products. We
currently  manufacture  our blood  plasma  thawers  and  freezers  that are less
technologically   sophisticated  products.   Although  we  have  redesigned  our
manufacturing  facility to accommodate  the  BioArchive  System and the CryoSeal
System,  we do not have  significant  experience  in  manufacturing  those  more
complex medical devices or in the manufacture of disposables. Furthermore, there
can be no assurance that our current resources and manufacturing  facility could
handle a significant  increase in orders for either the BioArchive System or the
CryoSeal System. If we are unable to produce enough to meet the demand for sales
of the new systems, we would need to contract with third-party manufacturers for
the

 7

backlog,  and there are no  assurances  that a third party will be  available or
will  produce  the  systems at  favorable  prices.  Inability  to have  products
manufactured  by third  parties at a  competitive  price will erode  anticipated
margins for such products, and negatively impact our profitability.

     Our New Products Are at Initial  Market  Introduction,  and We Are Not Sure
the Market  Will  Accept  Them.  The market  acceptance  of our new  products in
development  will depend  upon the  medical  community  and  third-party  payers
accepting  the  products as  clinically  useful,  reliable,  accurate,  and cost
effective  compared  to  existing  and future  products  or  procedures.  Market
acceptance  will also depend on our ability to adequately  train  technicians on
how to use the  CryoSeal  System  and  the  BioArchive  System.  Even if our new
product  systems are clinically  adopted,  the use may not be recommended by the
medical profession or hospitals unless acceptable reimbursement from health care
and third party payers is  available.  Failure of either of these new systems to
achieve significant market share could have material adverse effects on our long
term business, financial condition, and results of operation.

     Failure  to Keep Our  Senior  Management  Team  May  Adversely  Affect  Our
Operations.  We are  dependent  upon the  experience  and  services of Philip H.
Coelho, Chairman and Chief Executive Officer, and James H. Godsey, President and
Chief Operating  Officer.  The loss of either person would adversely  affect our
operations.  We have obtained key man life insurance  covering Mr. Coelho in the
amount of $2,000,000 as some protection against this risk.

     Product  Liability and  Uninsured  Risks May  Adversely  Affect  Continuing
Operations.  We may be liable if any of our products cause injury,  illness,  or
death.  We also may be required to recall  certain of our  products  should they
become  damaged  or if they are  defective.  We are not  aware  of any  material
product  liability  claim against us. Further,  we maintain a general  liability
policy that includes product liability coverage of $1,000,000 per occurrence and
$2,000,000 per year in the aggregate. However, a product liability claim against
us could have a material adverse effect on our business or financial condition.

     The Market Price for Our Common Stock May Fall if Selling  Stockholders  or
Other  Security  Holders  Sell A  Substantial  Amount of Their  Stock.  Under an
agreement  with the holders of the Series B preferred  stock,  we registered for
resale  shares of common stock to be issued upon the  conversion of the Series B
preferred  stock and upon the exercise of the warrants.  We have also registered
additional  shares of common  stock that may be issued  upon  conversion  of the
preferred stock if we elect to add accrued  dividends to the conversion value of
the preferred  stock.  Further,  if a substantial  decline in the average market
price of our common stock were to occur,  the conversion price would be set at a
lower price and additional shares may also be issued.  Because the trading price
for our  common  stock may be  affected  by the number of shares  available  for
resale,  the market price of our common stock could drop as a result of sales of
a large  number of  shares  of our  common  stock in the  market,  or due to the
perception that such sales could occur.

     We Could Be Required to Redeem Our Series B Convertible  Preferred Stock at
a Premium  Which Would Require a Large  Expenditure  of Capital and Could Have a
Material Adverse Affect on Our Financial Condition.  The holders of our Series B
convertible  preferred  stock  have the  right to force us to  repurchase  their
Series B convertible  preferred  stock at a premium if the Company takes certain
action,  deemed to be solely within the Company's  control such as,  causing the
Company to be delisted from the Nasdaq  Market,  or taking other defined  action
detrimental to the Series B preferred stockholders. The repurchase of our Series
B convertible preferred stock  would require a large  expenditure of capital and

 8

we may not have  sufficient  funds to satisfy the redemption.  In addition,  you
could  face  further  dilution  of your  ownership  percentage  as a result of a
decline  in the  market  price of our  common  stock or in the event of  certain
defaults  which  would  result in an  increase in the number of shares of common
stock issuable upon conversion of the Series B convertible  preferred stock. Any
such event  could  adversely  affect  the price of our stock and our  ability to
raise  additional  capital.  We have no  intention  of taking  action that would
require such an event.

     We Do Not Pay Cash Dividends. To date, we have not paid any cash dividends,
and we do not  expect  to pay any cash on our  common  stock in the  foreseeable
future.  The  Series B  convertible  preferred  stock  carries  a  mandatory  6%
dividend, paid quarterly,  out of funds legally available. At our election, that
dividend may be accrued to the conversion  value of that series of stock in lieu
of any cash payment.  With our current cash needs, we do not anticipate that the
dividend will be paid in cash and, therefore,  additional shares of common stock
may be issued upon conversion.

     The  Conversion  Price  of the  Series B  Preferred  Stock  is  Subject  to
Readjustment  That May  Adversely  Affect the Market Price For a Share of Common
Stock.  On December 22, 2000, the conversion  price for which Series B preferred
stock may be converted into shares of common stock was set at $1.6115 per share.
However,  the  conversion  price will be adjusted on June 22, 2001 and every six
months  thereafter to be the lesser of (a) 130% of the fixed conversion price of
$2.2719 or (b) 90% of the  average  market  price for the ten days prior to such
adjustment.  In a declining market,  this conversion feature may have the effect
of creating additional downward pressure on the price of our common stock.

     The Holders of the Series B Preferred Stock May Deliver  Registered  Shares
of Common Stock Against Short Positions  Which May Put Downward  Pressure on the
Price of a Share of Our Common  Stock.  The  holders  of the Series B  preferred
stock may deliver registered common stock against a short position.  Because the
conversion  price  represents a discount of the current trading price of a share
of common  stock,  a large  number of sales of common stock by, or coverage of a
large  short  position  by, the  Series B  Preferred  stockholders  will have an
adverse  effect  on the  price of our  common  stock.  The  Series  B  preferred
stockholders  have  agreed  that  they  will  not  engage  in  any  open  market
transactions in our securities, including any short sales, during the 20 trading
day period prior to any conversion price re-set date.

     Adoption  of New  Revenue  Recognition  Rules May Impact  Timing of Revenue
Recognition and May Cause Prior Revenue  Results to be Restated.  On December 3,
1999, the SEC staff issued Staff Accounting  Bulleting ("SAB") No. 101, "Revenue
Recognition." The Company's existing revenue  recognition policy is to recognize
revenue at the time the customer  takes title to the  product,  generally at the
time of shipment.  The Company is currently  assessing the impact,  if any, that
the SAB will have on its revenue recognition policy. Management is investigating
the new rules as it relates to the  installation  of the  BioArchive  system and
whether the Company practices may require the revenue  recognition of the entire
system to be delayed until the installation occurs.

     Dependence on Suppliers  for Custom  Components  may Impact the  Production
Schedule.  The Company obtains certain custom  components from one supplier.  If
the supplier raises the price of the component or discontinues  production,  the
Company will have to find another  qualified  supplier to provide the component.
However,  any transfer  between  qualified  suppliers may impact the  production
schedule,  thus delaying revenues,  and/or cause the price of the key components
to increase.

 9
                          SUMMARY FINANCIAL INFORMATION

     The following summary information is derived from the financial  statements
included in our Annual  Report on Form10-K  for the year ended June 30, 2000 and
Quarterly Report on Form 10-Q for the quarter ended March 31, 2001, incorporated
by reference  herein,  and should be read in  conjunction  with those  financial
statements and the related notes thereto.

                                                                                                 


                                                                                                 For the Nine Months Ended
                                                 For the Year Ended June 30,                              March 31,
                                                 ---------------------------                              ---------
                                       1998                 1999                 2000              2000               2001
                                       ----                 ----                 ----              ----               ----
Statement of Operations Data:
Revenues                            $4,482,000           $5,108,000           $4,211,000        $3,256,000         $4,563,000
Operating expenses                  $8,424,000           $6,729,000           $5,819,000        $4,183,000         $4,163,000
Net loss                           $(9,550,000)         $(6,098,000)         $(5,818,000)      $(4,311,000)       $(3,811,000)
Per Share Data:

Net loss before preferred stock    $(9,550,000)         $(6,098,000)         $(5,818,000)      $(4,311,000)       $(3,811,000)
dividend  or discount and
cumulative effect of
accounting change
Preferred stock dividend or              -              $(3,907,000)           $(905,000)        $(558,000)          $(92,000)
discount
Cumulative effect of accounting          -                   -                    -                  -              $(580,000)
change
Net loss to common                 $(9,550,000)        $(10,005,000)         $(6,723,000)      $(4,869,000)       $(4,483,000)
stockholders
Basic and diluted net loss per          $(0.54)              $(0.52)              $(0.30)           $(0.23)            $(0.15)
share before cumulative effect
of accounting change
Cumulative effect of accounting          -                   -                    -                  -                 $(0.02)
change
Basic and diluted net loss per          $(0.54)              $(0.52)              $(0.30)           $(0.23)            $(0.17)
common share
Shares used in computing per        17,629,876           19,242,310           22,288,912        21,454,848         26,389,540
share data



 10



                                                                                   


                                               June 30,                                  March 31,
                                               --------                                  ---------
                                      1999                 2000                  2000                2001
                                      ----                 ----                  ----                ----
Selected Balance Sheet Data:
Working Capital                    $5,085,000           $4,613,000            $5,925,000          $1,693,000
Total Assets                       $8,133,000           $6,735,000            $8,076,000          $5,983,000
Total Liabilities                  $1,413,000           $1,043,000           $   922,000          $3,321,000
Stockholders' Equity               $6,720,000           $5,692,000            $7,154,000          $5,692,000




                               THERMOGENESIS CORP.

     We design and sell  products  and devices  which  utilize  our  proprietary
thermodynamic technology for the processing of biological substances,  including
the cryopreservation,  thawing,  harvesting,  and archiving of blood components.
Historically, our primary revenues have been from sales of blood plasma freezers
and thawers to hospitals, blood banks, and blood transfusion centers. Currently,
we are manufacturing  several categories of thermodynamic devices that are being
sold to the blood plasma  industry  under FDA  clearance to market in the United
States. Other potential markets for our proprietary technology include surgical,
pharmaceutical,  and industrial applications. Since fiscal year 1998, we focused
our  efforts  on  research  and  development  and  refinement  of a core line of
products for blood banks.  Since fiscal 1994, we have developed new applications
for  our   products   and   technology,   including  a  system  for   harvesting
cryoprecipitated  AHF from a donor's  blood  plasma for use in the  treatment of
hemophilia,  and by some  physicians as a hemostatic  agent or tissue sealant in
certain surgical and medical procedures.

     Our strategy has been to develop superior blood processing  devices for the
niche blood  processing  markets  where new  products  could  quickly  establish
credibility for our proprietary technology. We believe that by concentrating our
products to serve the blood plasma  industry,  many  customers,  such as the Red
Cross or other blood transfusion societies of various countries,  would validate
our  proprietary  technology for rapid freezing of biological  substances,  more
specifically blood plasma.  Early products,  which received 510(k) permission to
market,  are sold to blood banks and  hospitals  either  directly or through our
distribution  network in the 32 countries  where our products are marketed.  See
our "Annual Report on Form 10-K. -- Description of the Business."

     From 1988 to 1992,  our products  were designed to transfer heat by causing
heat transfer liquids to directly contact plastic sealed containers within which
resided various blood components.  Early product designs used liquids containing
chloro-flouro-carbons  ("CFC")  which  we  phased  out  in  the  fall  of  1992.
Thereafter, we developed an alternative heat transfer method which automatically
interposed  a thin  flexible  membrane  between  the heat  transfer  liquid  and
biological  substances  which  process  allowed  for use of  non-CFC  based heat
transfer liquids.

     Principal  products  initially  developed by us and marketed to  hospitals,
blood banks, and blood transfusion centers consisted of freezers and thawers for
blood plasma. We have continued to design and develop various freezer models and
thawers for expanded  applications,  and these products remain the core products
of our current  business.  To expand our market and product use, we have changed
the focus  of our  research  and  development to the design of new products that

 11

would be applied to different applications within the blood industry,  including
surgical,  pharmaceutical,  and medical  procedures  that  utilize  freezing and
thawing  technology as part of standard  procedures.  See our "Annual  Report on
Form 10-K."

Our History

     Our core  expertise  lies in the  technical  fields of  thermodynamics  and
cryopreservation,  technologies  that we initially applied to the development of
ultra-rapid freezers and thawers,  which are currently being sold to blood banks
and hospitals in 32 countries  throughout the world. Until the fourth quarter of
fiscal year 1998, our revenues had been principally derived from these products.
Following four years of intensive research and development, we began shipping in
the  second  quarter of fiscal  year 1998 our new  platform  product  called the
BioArchive(R)  System.  The BioArchive  System is a computer-  controlled liquid
nitrogen    platform   with   dedicated    disposables   for   the   collection,
cryopreservation,  and  archive of blood and blood  components.  The  BioArchive
System is used  internationally and in the U.S. as part of a National Heart Lung
and Blood Institute study to process,  cryopreserve,  and archive  hematopoietic
stem and progenitor  cells sourced from  placental cord blood.  These stem cells
are then used to  reconstitute  the immune  system of  patients  suffering  from
leukemia,  lymphoma,  diverse inherited anemias, or hypoproliferative  stem cell
disorders.  We have entered into a period of rapid transformation as we begin to
manufacture and market micro-manufacturing  systems which may generate recurring
revenues from the ongoing sale of high margin blood processing disposables.

     Our  strategy  is  to  utilize  our  two  new  technology  platforms  - the
BioArchive Platform and the CryoSeal(TM)  Platform - as the basis for developing
micro-manufacturing  systems to  produce  biopharmaceutical  drugs  from  either
autologous  or  single-directed  donor  blood  which  will  compete in two major
medical  markets:  Wound Care and Cellular  Therapy.  Currently,  the Company is
aggressively  pursuing worldwide strategic partners in an effort to maximize the
value of its new technology platforms.

     We are incorporated in Delaware,  and our principal  executive  offices are
located  at 3146 Gold  Camp  Drive,  Rancho  Cordova,  California  95670 and our
telephone number is (916) 858-5100.

Recent Financing and Other Recent Events

     On April 27, 2001, we completed a private  placement of 3,944,047 shares of
common  stock,  raising an  aggregate of  $7,099,284,  before  direct  expenses.
Warrants  to purchase  788,809  shares of common  stock at an exercise  price of
$2.88 per share were also issued.  On December  21,  2000,  warrants to purchase
415,000  shares of common  stock at an  exercise  price of $1.625 per share were
issued in connection with our debt placement.  The net proceeds from the private
placement are being used to fund clinical trials through an independent Clinical
Research  Organization  to support the Company  claims for the  CryoSeal  Fibrin
Sealant System and for general working  capital.  Under the terms of the private
placement,  we are required to register for resale the common  shares and common
shares underlying the warrants.

                             SUMMARY OF THE OFFERING

     We are  registering  5,147,856  shares  of common  stock for  resale by the
selling  stockholders of which 1,203,809  shares may be issued upon the exercise
of warrants.

 12
                                 USE OF PROCEEDS

     We will  receive no proceeds  from the resale of the shares of common stock
by the selling stockholders.  We will, however,  receive proceeds if the selling
stockholders pay cash to exercise their warrants.  Those proceeds,  if any, will
be used for general working capital.

                              PLAN OF DISTRIBUTION

     The selling stockholders,  their pledgees,  donees,  transferees,  or other
successors  in interest may from time to time offer and sell all or a portion of
the  shares in  transactions  on the  Nasdaq  SmallCap  Market,  or on any other
securities  exchange or market on which the common stock is listed or traded, in
negotiated  transactions  or otherwise,  at prices then prevailing or related to
the then-current market price or at negotiated prices. The selling  stockholders
or their pledgees, donees, transferees, or other successors in interest may sell
their shares directly or through agents or broker-dealers acting as principal or
agent,  or in  block  trades  or  pursuant  to a  distribution  by one  or  more
underwriters on a firm commitment or best-efforts basis. To the extent required,
the names of any agent or broker-dealer and applicable  commissions or discounts
and any other required  information with respect to any particular offer will be
set  forth  in an  accompanying  Prospectus  supplement.  Each  of  the  selling
stockholders  and their  pledgees,  donees,  transferees or other  successors in
interest  reserves  the  right to  accept or  reject,  in whole or in part,  any
proposed purchase of the shares to be made directly or through agents.

     In connection with distributions of the shares, any selling stockholder may
enter into hedging  transactions with  broker-dealers and the broker-dealers may
engage in short sales of the shares in the course of hedging the positions  they
assume with the selling  stockholder.  Any selling stockholder also may sell the
shares short and deliver the shares to close out such short positions. See "Risk
Factors-The  Holders  of the Series B  Preferred  Stock May  Deliver  Registered
Shares of Common Stock Against Short Positions  Which May Put Downward  Pressure
on the Price of the Share of Common  Stock."  Any selling  stockholder  also may
enter into options or other  transactions with  broker-dealers  that involve the
delivery of the shares to the broker-dealers, which may then resell or otherwise
transfer such shares. Any selling stockholder also may loan or pledge the shares
to a broker-dealer and the broker-dealer may sell the shares so loaned or upon a
default may sell or otherwise transfer the pledged shares.  These activities are
mitigated by the Series B preferred stock purchase  agreement between us and the
Series B  convertible  preferred  stockholders  which  prohibits  trading in our
common  stock by the  Series B  preferred  stockholders  during the period of 20
trading  days  prior  to when  the  conversion  price  is  subject  to  periodic
adjustment.

     The  selling  stockholders,   any  agents,  dealers  or  underwriters  that
participate with the selling  stockholders in the resale of the shares of common
stock and the pledgees,  donees,  transferees or other successors in interest of
the selling  stockholders may be deemed to be "underwriters"  within the meaning
of the Securities  Act, in which case any  commissions  received by such agents,
dealers or underwriters and a profit on the resale of the shares of common stock
purchased by them may be deemed underwriting  commissions or discounts under the
Securities Act.

     There is no assurance that the selling stockholders will sell any or all of
the shares.

     Pursuant to registration  rights  agreements  between us and certain of the
selling  stockholders,  we have  agreed to pay all  expenses  of the Company and
selling  stockholders  incurred  in the  registration  of the shares  other than
brokerage commissions incurred by the selling stockholders.

 13

     In addition  to selling  their  common  stock  under this  Prospectus,  the
selling stockholders may:

     o    transfer their common stock in other ways not involving  market makers
          or established trading markets,  including by gift,  distribution,  or
          other transfer; or

     o    sell their common stock under Rule 144 of the Securities Act.

                              SELLING STOCKHOLDERS

     The following table  identifies the selling  stockholders,  as of April 27,
2001,  and  indicates  certain  information  known to us with respect to (i) the
number of shares of common  stock  held by the  selling  stockholders,  (ii) the
amount to be offered for the selling stockholders' account, and (iii) the number
of shares and  percentage of  outstanding  shares of common stock to be owned by
the  selling  stockholders  after the sale of the  common  stock  offered by the
selling  stockholders.  The selling stockholders are not obligated to sell their
common stock offered by this Prospectus.

     The number of shares  listed under "Shares to be Sold" in the table assumes
that the selling  stockholders  have  exercised  their warrants into the maximum
number of  shares  currently  permitted  and will  sell all  common  shares in a
secondary offering pursuant to this Prospectus.

     Under the Exchange Act, any person engaged in a distribution  of the shares
of our common stock offered by this Prospectus may not simultaneously  engage in
market making  activities with respect to our common stock during the applicable
periods prior to the commencement of such distribution. In addition, and without
limiting the foregoing,  each selling  stockholder  may be subject to applicable
provisions  of the  Exchange  Act  and  the  rules  and  regulations  thereunder
including,  without limitation,  Regulation M. Further, the selling stockholders
may resell their shares pursuant to Rule 144.

     The warrants are not  registered  or listed for trading on the Nasdaq Stock
Market or on any exchange.

     The 1,203,809 of the shares shown as owned and offered by the  stockholders
under this Prospectus may be issued upon exercise of warrants  acquired by these
selling stockholders from us in a private placement and resold.


                                                                                       


                                            Shares Owned                                   Shares Owned
                                        Prior to Offering(1)    Shares to be Sold         After Offering
                                        -----------------       -----------------         --------------
Name of Stockholder                            Number                Number           Number        Percentage
- -------------------                            ------                ------           ------        ----------
Federated Kaufmann Fund                    2,223,062(2)            1,666,662          556,400           1.8%
Pequot Navigator Offshore Fund, Inc.         120,000(3)              120,000                0             0
Pequot Scout Fund, LP                        240,000(4)              240,000                0             *
Roy Korins                                    69,500(5)               60,000            9,500             *
David L. Katsky                               61,750(6)               60,000            1,750             *
Stephen J. Swiatkiewicz                       15,000(7)               15,000                0             *




 14





Bernard McElhone                              30,000(8)               30,000                0             *
Atlas II, LP                               2,427,910(9)            2,000,910          427,000           1.3%
David Hardie Keogh                            16,665(10)              16,665                0             *
New England Venture Partners, LP             267,846(11)             177,846           90,000             *
Clarion Offshore Fund Ltd.                   100,800(12)             100,800                0             *
Clarion Partners, L.P.                       139,200(13)             139,200                0             *
Morton A. Cohen                              133,333(14)             133,333                0             *
Clarion Capital Corporation                  171,827(15)              99,996           71,831             *
Spencer Browne                               427,432(16)              43,332          384,100           1.2%
Philip Coehlo                                731,375(17)              44,446          686,929           2.2%
David Howell                                 129,000(18)              69,000           60,000             *
David Adams                                   22,834(19)              13,334            9,500             *
Sam Acosta                                   166,457(20)              13,332          153,125             *
Valor Capital Management, LP                  60,000(21)              60,000                0             *
HEH Investment Partners, LP                   90,000(22)              20,000           70,000             *
McEnany Holding, Inc.                        133,329(23)              20,000          113,329             *
Brian and Renee Ruecker                      124,874(24)               4,000          120,874             *



Footnotes to Table

 *       Less than one percent.

(1)  The ownership  includes options and warrants  exercisable on or before July
     15, 2001.
(2)  Includes 277,777 shares issuable upon the exercise of warrants.
(3)  Includes 20,000 shares issuable upon the exercise of warrants.
(4)  Includes 40,000 shares issuable upon the exercise of warrants.
(5)  Includes 10,000 shares issuable upon the exercise of warrants.
(6)  Includes 10,000 shares issuable upon the exercise of warrants.
(7)  Includes 2,500 shares issuable upon the exercise of warrants.
(8)  Includes 5,000 shares issuable upon the exercise of warrants.
(9)  Includes 583,485 shares issuable upon the exercise of warrants.
(10) Includes 2,777 shares issuable upon the exercise of warrants.
(11) Includes 59,641 shares issuable upon the exercise of warrants.
(12) Includes 16,800 shares issuable upon the exercise of warrants.
(13) Includes 23,200 shares issuable upon the exercise of warrants.
(14) Includes 22,222 shares issuable upon the exercise of warrants.
(15) Includes  16,666  shares  issuable  upon the exercise of warrants,  110,000
     shares  issuable upon the conversion of 22,000 shares of Series A Preferred
     Stock and 26,831 shares issuable upon the conversion of 40 shares of Series
     B Preferred Stock at the current  conversion  price of $1.6115 plus accrued
     interest.
(16) Includes  15,555  shares  issuable upon the exercise of warrants and 40,000
     shares issuable upon the exercise of options.
(17) Includes  21,003 shares  issuable upon the exercise of warrants and 316,667
     shares issuable upon the exercise of options.
(18) Includes  19,000  shares  issuable upon the exercise of warrants and 40,000
     shares issuable upon the exercise of options. Mr. Howell is


 15

     the President and General Partner of New Venture Partners. (See Footnote 11
     for  ownership.)  Mr.  Howell  disclaims  ownership of 89.8% of New England
     Venture Partners, LP.
(19) Includes 4,723 shares issuable upon the exercise of warrants.
(20) Includes  4,722 shares  issuable  upon the exercise of warrants and 153,125
     shares issuable upon the exercise of options.
(21) Includes 10,000 shares issuable upon the exercise of warrants.
(22) Includes  20,000  shares  issuable  upon the  exercise of  warrants.  Also,
     includes  60,000  shares  issuable  upon the exercise of options and 10,000
     shares issuable upon the exercise of warrants owned by Dr. Hubert Huckel.
(23) Includes  20,000  shares  issuable  upon the  exercise of  warrants.  Also,
     includes 43,329 shares, 60,000 shares issuable upon the exercise of options
     and 10,000  shares  issuable  upon the  exercise of  warrants  owned by Mr.
     Patrick McEnany.
(24) Includes  4,000  shares  issuable  upon the exercise of warrants and 97,400
     shares issuable upon the exercise of options.



Relationship with Selling Stockholders

     Philip  Coehlo is our Chief  Executive  Officer and  Chairman of the Board.
Spencer  Browne and David  Howell are  members  of our Board of  Directors.  New
England Venture  Partners LP is an affiliate of David Howell.  McEnany  Holding,
Inc. is an affiliate of Pat McEnany, a Director.  HEH Investment Partners,  L.P.
is an  affiliate  of  Hubert  Huckel,  a  Director.  Renee  Ruecker  is our Vice
President  of  Finance.  Sam  Acosta  is our  Vice  President  of  Manufacturing
Operations.  David Adams is a shareholder of Bartel Eng & Schroder,  our outside
Counsel.  Mr Adams previously served as General Counsel and was also our interim
Vice  President of  Regulatory  Affairs and Quality  Systems.  None of the other
selling  stockholders has had any material  relationship with us within the past
three years.

                            DESCRIPTION OF SECURITIES

     Our authorized  capital stock consists of two classes:  50,000,000  shares,
$.001 par value,  of common  stock and  2,000,000  shares,  $.001 par value,  of
preferred  stock. As of April 30, 2001,  31,354,576  shares of common stock were
outstanding,  158,000 shares of Series A preferred stock were  outstanding,  and
570  shares of Series B  preferred  stock were  outstanding.  There are no other
series of preferred stock outstanding.

Common Stock

     Common stock holders have full voting rights,  one vote for each share held
of record.  Subject to  preferential  rights of Series A and Series B  preferred
stockholders,  common  stockholders are entitled to receive  dividends as may be
declared by the Board out of funds  legally  available  therefor,  and share pro
rata in any distributions to stockholders upon liquidation.  Common stockholders
have  no  conversion,  preemptive,  or  other  subscription  rights.  All of the
outstanding  shares of common stock are, and the common  shares  offered  hereby
will be, validly issued, fully paid, and nonassessable.

Preferred Stock

     As discussed below, we have two series of preferred stock  designated.  The
Board is authorized to establish other series or designations of preferred stock
with rights,  preferences,  privileges,  and  restrictions  on such stock as the
Board  may  determine,  subject  to the  rights  of the  outstanding  series  of
preferred stock.

 16

Series A Convertible Preferred Stock

     We have  designated  1,200,000  shares  as Series A  convertible  preferred
stock. Each share of Series A preferred stock has the following characteristics:

     Conversion. Each share of Series A preferred stock is convertible into five
shares of common  stock at the option of the  holder or at our  option  provided
that the common  stock is trading at an average  price equal to or greater  than
$5.00  per  share  for 30  consecutive  trading  days.  Each  share of  Series A
preferred stock is subject to customary anti-dilution protection.

     Voting Rights. Provided that more than 35% of the original number of Series
A preferred stock shares remain outstanding, the Series A preferred stockholders
are  entitled to vote for one  director,  as a separate  class,  and approval by
holders of at least a majority of the Series A preferred stock,  voting together
as a separate class,  is required for certain events  including (i) any issuance
of a new series of shares having rights, preferences, or privileges with respect
to liquidation preference, redemption or dividend rights senior or equivalent to
the Series A preferred  stock,  (ii) any payment or declaration of any dividends
rights or any other  distribution  or  redemption  of any of our capital  stock,
(iii) sale or  disposition of  substantially  all of our property or business or
any  consolidation  or merger with any entity in which we are not the  survivor,
(iv) an  amendment  to our  articles  of  incorporation  or bylaws,  and (v) any
investments of another  business  exceeding $1 million in the aggregate.  Unless
required by law, the Series A preferred stockholders will be entitled to vote on
all other matters with the common  stockholders,  together as a class,  on an as
converted basis. The Series A preferred stockholders have approved by a majority
vote the  issuance of the Series B  preferred  shares on a pari passu basis with
the Series A shares.

     Dividends.  Each share of Series A  preferred  stock is entitled to receive
non-cumulative  dividends  at the  same  rate  and  same  time as any  dividends
declared on our common stock determined on an as converted basis.

     Liquidation  Rights.  Upon liquidation,  dissolution,  or winding up of our
company,  the holder of Series A preferred stock shall be entitled to received a
liquidation preference equal to $6.25 per share which shall increase at the rate
of 8% per share, per year,  compounded  annually on each anniversary date of the
issuance of the Series A preferred stock before there are any  distributions  to
common  stockholders.  After payment to Series A preferred  stockholders  of the
liquidation  preference as adjusted,  the Series A preferred  stockholders shall
not  be  entitled  to  any  further  distribution.   If  upon  any  liquidation,
dissolution,  or  winding  up the  assets to be  distributed  among the Series A
preferred stockholders shall be insufficient for full payment of the liquidation
preference,  then the amount to be distributed  shall be distributed  ratably to
the Series A preferred stockholders and any other preferred stock of equal rank.

     Preemptive  Rights.  Each Series A  preferred  stockholder  has  preemptive
rights to purchase any new share  issuance by us in order to maintain his or her
percentage share ownership interest in our company.

Series B Convertible Preferred Stock

     We have designated  4,080 shares as Series B convertible  preferred  stock.
Each share of Series B preferred stock has the following characteristics:

 17

     Conversion.  The Series B convertible  preferred stock is currently limited
in  conversion  to a maximum  of  4,236,000  shares,  under  all  circumstances.
However,  the  conversion  price is a fixed  conversion  price of $1.6115  which
represents  the average  market price of our common stock for the ten days prior
to the reset date of December 22, 2000. The conversion price will be adjusted on
June 22,  2001 and every six months  thereafter  to be the lesser of (a) 130% of
the fixed  conversion  price as stated above,  or (b) 90% of the average  market
price for the ten days prior to such  adjustment  date. If certain events occur,
such as our inability to provide the Series B preferred stockholders with common
stock on a timely basis, or our failure to pay any applicable  redemption  price
when due and such events are deemed not within the  Company's  control,  meaning
they result by no action or inaction on the Company's part, the conversion price
will be adjusted to an amount equal to 70% of what it otherwise  would have been
at that time.  The  adjusted  conversion  price will be in effect for the period
beginning on the date of event and for sixty days thereafter.

     In addition,  the conversion  price will be subject to adjustment if, based
on the then  current  conversion  price,  the  Series B  preferred  stock may be
converted  into  20% or more of the  common  stock  outstanding  and we have not
previously obtained  stockholder approval to issue more than 20%. In such event,
the  conversion  price will be  adjusted  to 80% of the then  conversion  price.
Further,  due to Nasdaq  SmallCap  listing  requirements,  the  Company  will be
required to seek stockholder  approval to allow for the conversion of the Series
B  preferred  stock  in an  amount  exceeding  20% or more of its  common  stock
outstanding  before issuance.  If we fail to obtain  stockholder  approval,  the
conversion  price  will be  adjusted  to 60% of the  then  conversion  price  by
contract, we cannot issue more than the 20% without stockholder approval.

     Upon an adjustment of the conversion price, the number of shares into which
the Series B  convertible  preferred  stock may be converted is  correspondingly
adjusted.  The conversion  price and number of shares of common stock underlying
the Series B convertible preferred stock is also subject to adjustment for stock
splits,  stock dividends,  combinations,  capital  reorganizations,  and similar
events relating to our common stock.

     The  holders of stock  cannot  convert the Series B  convertible  preferred
stock into  common  stock  beyond  that  which  would  result in their  holdings
exceeding  more  than  4.9% of the then  issued  and  outstanding  shares.  This
provision was negotiated  between us and the holders of the Series B Convertible
preferred stock.

     Voting  Rights.  The Series B  convertible  preferred  stock has no general
voting rights. However, holders of the Series B convertible preferred stock have
the right to consent to the issuance of any capital  stock that is senior to the
Series B convertible  preferred  stock,  to any amendment of our  certificate of
incorporation  which  materially and adversely  affects the Series B convertible
preferred  stock,  and to any amendment to the terms of the Series B convertible
preferred stock. In addition,  pursuant to the purchase  agreements entered into
in  connection  with the issuance of the Series B convertible  preferred  stock,
without the consent of the holders of the Series B convertible  preferred stock,
we may not issue for approximately  twelve months after issuance of the Series B
preferred stock, any common stock (or securities convertible into common stock),
at a price below the market  price of the common  stock on the date of issuance,
except in certain specified  instances.  For  approximately  twelve months after
issuance,  the holders of the Series B convertible  preferred  stock also have a
right of first refusal to acquire any such equity securities except in specified
instances set forth in the purchase agreements.

 18

     Dividends.  Dividends  at the rate of $60 per  annum  per share of Series B
preferred stock (6% annual dividend) are payable in cash or, at our option,  may
be added to the value of the Series B  convertible  preferred  stock  subject to
conversion  and to the $1,000 per share  liquidation  preference of the Series B
convertible preferred stock.

Redemption

     By Us. If we are in  compliance  with the terms of the Series B convertible
preferred  stock and our  agreements  with the  Series B  convertible  preferred
stockholders,  we have the right at any time to redeem the Series B  convertible
preferred  stock  at  a  premium  (generally,  120%  of  the  $1,000  per  share
liquidation  value  plus  accrued  and  unpaid  dividends),  and  under  certain
circumstances,  at the market  value of the common stock into which the Series B
convertible  preferred stock would otherwise be convertible.  Assuming we are in
compliance  with such  terms and  agreements,  after  the third  anniversary  of
issuance,  we may  redeem  the  Series  B  convertible  preferred  stock  at its
liquidation value plus accrued and unpaid dividends.

     By the  Holders of the Series B  Convertible  Preferred  Stock.  If certain
events occur which are solely  within our  control,  the holders of the Series B
convertible  preferred stock have the right to request that we repurchase all or
some of their Series B convertible preferred stock at the greater of the premium
or converted market value.  Those events in which holders may request repurchase
include the following:

o    there is no  closing  bid  price  reported  for our  common  stock for five
     consecutive trading days;

o    our common  stock  ceases to be listed for  trading on the Nasdaq  SmallCap
     Market;

o    the holders of the Series B convertible  preferred stock are unable, for 30
     or more days  (whether  or not  consecutive),  to sell their  common  stock
     issuable  upon  conversion  of the  Series B  convertible  preferred  stock
     pursuant to an effective registration statement;

o    we default under any of the agreements relating to our sale of the Series B
     convertible  preferred  stock,  including  our  failure  to timely  deliver
     certificates for common stock upon conversion;

o    certain business combination events;

o    the adoption of any amendment to our Articles of  Incorporation  materially
     adverse to the holders of the Series B convertible  preferred stock without
     the  consent  of the  holders of a  majority  of the  Series B  convertible
     preferred stock; and

o    the  holders  of the  Series B  convertible  preferred  stock are unable to
     convert all of their shares because of limitations under exchange or market
     rules that require  stockholder  approval of certain stock issuances and we
     fail to obtain such approval.

     However, we may issue a Control Notice to eliminate any repurchase right if
the events are not solely within our control.

     Liquidation  Rights.  Upon  liquidation,   the  holders  of  the  Series  B
convertible preferred stock will be entitled to receive, before any distribution
to holders of our common stock or any other class or

 19



series of our capital stock ranking junior to the Series B convertible preferred
stock, liquidation distributions equal to $1,000 per share, plus any accrued and
unpaid dividends.

Stock Options

         As of April 26, 2001, we had outstanding options to purchase a total of
2,299,285 shares of common stock at exercise prices ranging from $1.125 to $4.50
per share, of which options to purchase  2,019,969 shares were exercisable. Some
of these options are subject to vesting, and in general, have a three or five
year exercise period. See our "Annual Report on Form 10-K - Notes to Financial
Statements."

Other Warrants

         As of April 27, 2001, warrants to purchase a total of 3,549,734 shares
of common stock were outstanding with exercise prices ranging from $1.50 to
$3.00 per share, all of which were exercisable. Included in the number of
warrants are warrants to purchase 1,203,809 shares of common stock which are
subject to resale by this Prospectus. See our "Annual Report on Form 10-K -
Notes to Financial Statements" which is incorporated by reference in this
Prospectus.

                     CERTIFICATE OF INCORPORATION AND BYLAWS

     Our Amended and Restated Certificate of Incorporation provides that we will
indemnify  directors and officers of the company to the fullest extent permitted
by  Delaware  Law.  Further,  our bylaws  provide  authority  for the company to
maintain a liability insurance policy that insures directors or officers against
any liability incurred by them in serving for the company.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors,  officers, and controlling persons of the company
pursuant to the foregoing provisions, or otherwise, we have been advised that in
the opinion of the Commission such  indemnification  is against public policy as
expressed in the Securities Act and is, therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment  by  us  of  expenses  incurred  or  paid  by a  director,  officer,  or
controlling person of the company in the successful defense of any action,  suit
or proceeding) is asserted by such director,  officer,  or controlling person in
connection with the securities being registered,  we will, unless in the opinion
of our counsel the matter has been settled by controlling precedent, submit to a
court of appropriate  jurisdiction the question whether such  indemnification by
it is against  public  policy as  expressed  in the Act and will be  governed by
final adjudication.

                                 TRANSFER AGENT

     The  transfer  agent for our common  stock is  Computershare  Transfer  and
Trust, 12039 West Alameda Parkway, Suite Z-2, Lakewood 80201-1596.

                                     EXPERTS

     Ernst &  Young  LLP,  independent  auditors,  have  audited  our  financial
statements and schedule  included in our Annual Report on Form 10-K for the year
ended June 30, 2000, as set forth in their report (which contains an explanatory
paragraph describing conditions that raise substantial doubt about the Company's
ability to continue as a going  concern as described in Note 1 to the  financial
statements),

 20

which is  incorporated  by reference  in this  Prospectus  and  elsewhere in the
registration  statement.  Our financial statements and schedule are incorporated
by reference in reliance on Ernst & Young LLP's report, given on their authority
as experts in accounting and auditing.

                                  LEGAL MATTERS

     The  validity  of the  shares  of  common  stock  offered  by  the  selling
stockholders  through this Prospectus will be passed upon for us by Bartel Eng &
Schroder. Mr. Adams, a shareholder of Bartel Eng & Schroder,  beneficially owned
warrants  to acquire  4,722  shares of common  stock and owned  outright  18,110
shares  of common  stock as of April 30,  2001  which  represents  less than one
percent of the total outstanding number of shares.

                       WHERE CAN YOU FIND MORE INFORMATION

     Government Filings: We file annual, quarterly and special reports and other
information with the Securities and Exchange  Commission.  You may read and copy
any document that we file at the Commission's Public Reference Room at 450 Fifth
Street,  N.W., Room 1024,  Washington,  D.C. 20549,  and at its regional offices
located at 7 World Trade Center,  13th Floor,  New York, New York 10048,  and at
Northwest  Atrium Center,  500 Madison  Street,  Suite 1400,  Chicago,  Illinois
60661.  Please call the Securities and Exchange Commission at 1-800-SEC-0330 for
more information  about the Public Reference Rooms. Most of our filings are also
available  to you free of charge at the  Securities  and  Exchange  Commission's
website at http://www.sec.gov.

     Stock Market:  Our common stock is listed on the Nasdaq SmallCap Market and
similar  information  can be inspected and copied at the offices of the National
Association of Securities Dealers, Inc., 1735 K Street, N.W.,  Washington,  D.C.
20006.

     Registration  Statement:  We have filed a registration  statement under the
Securities Act of 1933, as amended,  with the Securities and Exchange Commission
with  respect to the  common  stock  offered  under  this  Prospectus,  and this
Prospectus  is a part of  that  registration  statement.  However,  it does  not
contain all of the information  contained in the registration  statement and the
exhibits  filed  with  the  registration  statement.  You  should  refer  to the
registration statement and its exhibits for further information about us and the
common stock offered under this Prospectus.

     Information   Incorporated  by  Reference:   The  Securities  and  Exchange
Commission  rules and  regulations  allow us to  "incorporate  by reference" the
information that we file with the Securities and Exchange Commission. This means
that we can disclose  additional  important  information  to you by referring to
those documents.  The information incorporated by reference is an important part
of  this  Prospectus,  and  information  that we file  in the  future  with  the
Securities and Exchange Commission will automatically  update and supersede this
information.  We have filed the  following  documents  with the  Securities  and
Exchange  Commission  and  the  information  contained  in  those  documents  is
incorporated by reference into this Prospectus:

     (1)  Annual Report on Form 10-K for the year ended June 30, 2000;

     (2)  Quarterly  Reports on Form 10-Q for the quarter  ended  September  30,
          2000, December 31, 2000 and March 31, 2001;

 21

     (3)  Proxy  Statement  for  the  Annual  Meeting  of  Stockholders  held on
          December 14, 2000; and

     (4)  The description of our common stock contained in Form 8-A.

     Please  note that all other  documents  and reports  filed  under  Sections
13(a),  13(c),  14 or 15(d)  of the  Securities  and  Exchange  Act of 1934,  as
amended,  following the date of this  Prospectus and prior to the termination of
this  offering  will  be  deemed  to be  incorporated  by  reference  into  this
Prospectus  and  will be made a part of it from  the  date of  filing  with  the
Securities and Exchange Commission.

 22

                       GLOSSARY OF CERTAIN TECHNICAL TERMS


510(k):  formal  notification  to the Food and Drug  Administration  ("FDA")  by
manufacturers  of Class I devices  to obtain  clearance  to market  the  medical
device.  The device must be  substantially  equivalent  to devices  manufactured
prior to 1976.

AUTOLOGOUS:  autogenous; related to self; originating within an organism itself,
as obtaining blood from the patient for use in the same patient. ----

CRYOPRECIPITATE:  any precipitate (substance that is separated out of a solution
of plasma) that results from cooling, as cryoglobulin or antihemophilic factor.

CRYOPRECIPITATED AHF: a preparation of antihemophilic  factor, which is obtained
from a single unit of plasma collected and processed in a closed system.

CRYOPRESERVATION:  maintaining  the life of excised tissue or organs by freezing
and storing at very low temperatures.

CRYOSEAL(TM):  system  for  harvesting  fibrinogen-rich  cryoprecipitate  from a
donor's blood plasma,  a blood  component that is currently  licensed by the FDA
for the treatment of clotting protein deficient patients.

FIBRINOGEN:  a blood  protein  that is  converted  to fibrin in the  clotting of
blood.

HEMOSTATIC:  (1) checking the flow of blood; (2) an agent that stops the flow of
blood.

PLATELET  DERIVED GROWTH FACTOR (PDGF):  a substance  contained in platelets and
capable of inducing  proliferation  of vascular  cells,  vascular  smooth muscle
cells; its action contributes to the repair of damaged vascular walls.

PROGENITOR: a parent or ancestor.


THERMOLABILE: easily altered or decomposed by heat.


 II-1
                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution.

     The  following  table  sets  forth the costs and  expenses  payable  by our
company in connection with the issuance and distribution of the securities being
registered  hereunder.  No expenses shall be borne by the selling  stockholders.
All of the amounts shown are estimates, except for the SEC registration fee.


SEC registration fee                                   $  3,112.84
Printing and engraving expenses                        $      0.00
Accounting fees and expenses                          *$ 20,000.00
Legal fees and expenses                               *$ 25,000.00
Transfer agent and registrar fees                     *$      0.00
Fees and expenses for qualification
 under state securities laws                           $  4,645.00
Miscellaneous                                         *$ 47,112.84

TOTAL                                                  $ 99,870.68
                                                       ===========

*  estimated


Item 15. Indemnification of Directors and Officers

     Section 145 of the Delaware General Corporation Law permits indemnification
of directors,  officers,  and employees of corporations under certain conditions
and subject to certain  limitations.  Article Eighth of our Amended and Restated
Certificate of Incorporation  contain provisions for the  indemnification of its
directors and officers to the fullest extent permitted by law.

     Under such law, we are  empowered to  indemnify  any person who was or is a
party or is  threatened  to be made a party  to any  proceeding  (other  than an
action by or in the right of our  company to procure a judgment in its favor) by
reason of the fact that such person is or was an officer, director,  employee or
other agent of our company or our  subsidiaries,  against  expenses,  judgments,
fines,  settlements,  and other  amounts  actually  and  reasonably  incurred in
connection  with such  proceeding,  if such person  acted in good faith and in a
manner such person  reasonably  believed to be in our best interests and, in the
case of a criminal proceeding, has no reasonable cause to believe the conduct of
such person was  unlawful.  In addition,  we may  indemnify,  subject to certain
exceptions, any person who was or is a party or is threatened to be made a party
to any  threatened,  pending,  or  completed  action  by or in the  right of our
company  to  procure  a  judgment  in our  favor by reason of the fact that such
person is or was an officer, director, employee or other agent of our company or
our  subsidiaries,  against  expenses  actually and reasonably  incurred by such
person in  connection  with the  defense or  settlement  of such  action if such
person  acted in good faith and in a manner  such  person  believed to be in the
best interest of our company and stockholders.  We may advance expenses incurred
in  defending  any  proceeding  prior to final  disposition  upon  receipt of an
undertaking  by the agent to repay that amount it shall be  determined  that the
agent is not entitled to indemnification as authorized.

 II-2

     In addition,  we have director's and officer's liability  insurance,  which
our bylaws provide authority to maintain to insure directors or officers against
any liability incurred capacity as such, or arising out of their status as such.

Item 16.          Exhibits and Financial Statement Schedules

Exhibit   Description
- -------   -----------
3.1      (a) Amended and Restated Certificate of Incorporation               (4)
         (b) Revised Bylaws                                                  (4)

4.1          Certificate of Designation Series A Convertible Redeemable
             Preferred Stock                                                (12)

4.2          Certificate of Designation of Series B Convertible
             Preferred Stock                                                (16)

4.3          Warrant [form]                                                 (18)

5.1          Opinion of David C. Adams, General Counsel to the registrant

10.1     (a) Letter of Agreement with Liquid Carbonic, Inc.                  (1)

         (b) Letter of Agreement with Fujitetsumo USA                        (1)

         (c) Letter of Agreement with Fujitetsumo Japan                      (1)

         (d) License Agreement between Stryker Corp. and
             THERMOGENESIS CORP., Corp.                                      (5)

         (e) Lease of Office and Mfg. Space                                  (4)

         (f) Executive Development and Distribution Agreement
             between THERMOGENESIS CORP. and Daido Hoxan Inc.                (3)

         (g) Administrative Office Lease                                     (6)

         (h) Employment Agreement for David C. Adams                        (11)

         (i) Employment Agreement for James H. Godsey                       (11)

         (j) Employment Agreement for Sam Acosta                            (11)

         (k) Licensing/Manufacturing Agreement with On-Time Mfg.             (8)

         (l) License Agreement and distribution with Asahi Medical           (9)

         (m) License Agreement with Pall/Medsep Corporation                 (10)

         (n) Distribution Agreement with Dideco S.P.A.                      (13)

         (o) Employment Agreement for Philip H. Coelho                      (15)

         (p) Employment Agreement for Renee Ruecker                         (15)

         (q) Amendment to License Agreement with Asahi Medical              (15)

         (r) Subscription Agreement dated December 22, 1999 [form]          (16)

         (s) Employment Agreement for Dan Segal                             (17)

         (t) Unit Purchase Agreement dated April 27, 2001 [form]            (18)

23.1         Consent of Bartel Eng & Schroder is contained in exhibit 5.1.

23.2         Consent of Ernst & Young LLP, independent auditors


  II-3

Footnotes to Index

(1)  Incorporated  by  reference  to  Registration  Statement  No.  33-37242  of
     THERMOGENESIS CORP., Corp. filed on February 7, 1991.

(2)  Incorporated by reference to Form 8-K for July 19, 1993.

(3)  Incorporated by reference to Form 8-K for June 9, 1995.

(4)  Incorporated by reference to Form 10-KSB for the year ended June 30, 1994.

(5)  Incorporated by reference to Form 8-K for September 27, 1995.

(6)  Incorporated by reference to Form 10-QSB for the quarter ended December 31,
     1995.

(7)  Incorporated by reference to Form 8-K for November 27, 1996.

(8)  Incorporated by reference to Form 10-KSB for the year ended June 30, 1996.

(9)  Incorporated by reference to Form 8-K for May 29, 1996.

(10) Incorporated by reference to Form 8-K for March 27, 1997.

(11) Incorporated by reference to Form 10-K for the year ended June 30, 1997.

(12) Incorporated by reference to Form 8-K for January 14, 1998.

(13) Incorporated by reference to Form 8-K for February 16, 1998.

(14) Incorporated by reference to Form 10-K for the year ended June 30, 1998.

(15) Incorporated by reference to Form 10-K for the year ended June 30, 1999.

(16) Incorporated by reference to Form 8-K for December 23, 1999.

(17) Incorporated by reference to Form 10-K for the year ended June 30, 2000.

(18) Incorporated  by  reference  to Form 10-Q for the  quarter  ended March 31,
     2001.

Item 17. Undertakings

(a)  The undersigned Company hereby undertakes:

     (1)  To file,  during any period in which offers or sales are being made, a
          post-effective amendment to this registration statement:

          (i)  To include any Prospectus  required by Section  (10)(a)(3) of the
               Securities Act;

          (ii) To reflect in the  Prospectus  any facts or events  arising after
               the effective  date of this  Registration  Statement (or the most
               recent post-effective  amendment thereof) which,  individually or
               in  the  aggregate,   represent  a  fundamental   change  in  the
               information set forth in the Registration Statement;

 II-4

          (iii)To include any material  information  with respect to the plan of
               distribution  not  previously   disclosed  in  this  Registration
               Statement  or any  material  change  to such  information  in the
               Registration Statement.

               Provided,  however,  that  paragraphs  (a)(1)(i) and  (a)(1)(ii),
               above, do not apply if the information required to be included in
               a  post-effective  amendment by these  paragraphs is contained in
               periodic  reports  filed  with  or  furnished  by the  Registrant
               pursuant  to  Section  13 or 15(d) of the  Exchange  Act that are
               incorporated by reference in the Registration Statement.

     (2)  That,  for  the  purpose  of  determining   any  liability  under  the
          Securities Act, each such post- effective amendment shall be deemed to
          be a new  registration  statement  relating to the securities  offered
          therein,  and the  offering of such  securities  at that time shall be
          deemed to be the initial bona fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment any
          of  the  securities   being  registered  that  remain  unsold  at  the
          termination of the offering.

(b)  The  undersigned   Registrant  hereby  undertakes  that,  for  purposes  of
determining  liability under the Securities Act, each filing of the Registrant's
annual  report  pursuant to Section  13(a) or Section  15(d) of the Exchange Act
that is incorporated by reference in this Registration Statement shall be deemed
to be a new registration  statement  relating to the securities  offered herein,
and the  offering  of such  securities  at that  time  shall be deemed to be the
initial bona fide offering thereof.

(h) Insofar as indemnification  for liabilities arising under the Securities Act
of 1933 may be  permitted to  directors,  officers  and  controlling  persons of
THERMOGENESIS  CORP.  pursuant  to  the  foregoing  provisions,   or  otherwise,
THERMOGENESIS  CORP. has been advised that in the opinion of the Commission such
indemnification  is  against  public  policy  as  expressed  in the  Act and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities  (other than the payment by the Company of expenses incurred or
paid  by a  director,  officer  or  controlling  person  of the  Company  in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered,  the Company  will,  unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as  expressed  in the  Securities  Act and will be  governed by the final
adjudication of such issue.



                                   SIGNATURES

     Pursuant to the  requirements  of the  Securities  Act of 1933, the Company
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements for filing Form S-3 and has duly caused this registration statement
to be signed on its behalf by the  undersigned,  thereunto duly  authorized,  in
Rancho Cordova, County of Sacramento, State of California, on May 14, 2001.


                                            THERMOGENESIS CORP.


                                            /s/ Philip H. Coelho
                                            -----------------------------------
                                            Philip H. Coelho, Chairman & C.E.O.

Pursuant to the  requirements of the Securities Act of 1933,  this  registration
statement has been signed below by the following  persons in the  capacities and
on the dates indicated:

/s/ Philip H. Coelho                                    Dated:  May 14, 2001
- -------------------------------------------
Philip H. Coelho, C.E.O.
and Chairman of the Board
(Principal Executive Officer)

/s/ Renee M. Ruecker                                    Dated:  May 11, 2001
- -------------------------------------------
Renee M. Ruecker, Vice President Finance
(Principal Accounting Officer and
Principal Financial Officer)

/s/ James H. Godsey                                     Dated:  May 11, 2001
- -------------------------------------------
James H. Godsey, President, C.O.O. Director


/s/ Hubert E. Huckel                                    Dated:  May 14, 2001
- -------------------------------------------
Hubert E. Huckel, Director


/s/ Patrick McEnany                                     Dated:  May 14, 2001
- -------------------------------------------
Patrick McEnany, Director


/s/ David S. Howell                                     Dated:  May 14, 2001
- -------------------------------------------
David S. Howell, Director


/s/ Spencer Browne                                      Dated:  May 14, 2001
- -------------------------------------------
Spencer Browne, Director