EXHIBIT 10.30

                              PATENT AND TRADEMARK
                               SECURITY AGREEMENT


          THIS AGREEMENT is made on the 31st day of July, 1996, and entered into
between   VEECO  INSTRUMENTS  INC.,  a  Delaware  corporation  ("Veeco"),  Sloan
Technology  Corporation,  a  Delaware corporation  ("Sloan"  and,  together with
Veeco, the "Debtors") FLEET BANK, N.A., a national banking association organized
under the laws  of the United States  of America ("Agent"), as  collateral agent
for Fleet  Bank, N.A., The  Chase Manhattan Bank, and  each other bank  that may
hereafter become a  "Bank" under the terms  of the Credit Agreement  referred to
below  (collectively, "Secured  Parties").   All capitalized  terms used  herein
without definition  shall have the  respective meanings ascribed thereto  in the
Credit Agreement.

          WHEREAS,  Veeco  and  Secured  Parties  have  entered  into  a  Credit
Agreement  dated  as  of  the date  hereof  (as  it  may  be hereafter  amended,
supplemented  or  otherwise  modified  from  time to  time,  being  the  "Credit
Agreement"; capitalized terms used  herein and not defined herein shall have the
meanings  given to  them  in the  Credit Agreement)  pursuant  to which  Secured
Parties  may lend to  Veeco the aggregate  principal amounts  set forth therein,
upon and subject to the terms and conditions thereof; 

          WHEREAS,  Sloan has  executed  a  Guarantee in  favor  of the  Secured
Parties, dated the  date hereof (the "Guarantee"),  and each of the  Debtors has
executed a Security Agreement in favor of Secured  Parties, dated as of the date
hereof (the "Security Agreements"); 

          WHEREAS, it  is a condition precedent to the obligation of the Secured
Parties to extend  credit to Veeco under the Credit Agreement that Debtors shall
execute and deliver this Agreement; and

          WHEREAS, each of the Debtors wishes to grant security and assurance to
Secured Parties  in  order  to  secure  the  performance  by  Debtors  of  their
respective  obligations  under  the  Credit  Agreement, the  Guarantee  and  all
documents  executed  in   connection  therewith,  including  all   interest  due
thereunder ("Obligations"), and to that effect Debtors agree to grant to Secured
Parties a lien upon and security interest in certain patent and trademark rights
as more fully described herein.

          NOW,  THEREFORE, in  consideration of  the  premises and  in order  to
induce the Secured Parties to extend credit to Veeco, Debtors agree with Secured
Parties as follows:

          1.   To  secure   the  complete   and  timely   satisfaction  of   all
Obligations, each of  the Debtors hereby grants  to Secured Parties a  lien upon
and security interest in all of  such Debtor's right, title and interest  in and
to the  patents  and trademarks  listed on  Schedule A  and  Schedule B  hereto,
respectively  (as they may  be amended pursuant  hereto from time  to time), all
proceeds thereof (including but not limited to license royalties and proceeds of
infringement  suits thereon),  the right  to sue  for  past, present  and future
infringements, all rights corresponding 









thereto  throughout the world, all reissues, divisions, continuations, renewals,
extensions and continuations-in-part  thereof, and all applications  for patents
and  patents and  all  applications  for trademarks  and  trademarks of  Debtors
hereafter filed or acquired, together with all good will associated with any and
all  of  the  foregoing and  all  proceeds  of  any  and all  of  the  foregoing
(collectively, the "Patents  and Trademarks").  Each of  the Debtors is granting
only a lien upon and security interest in its respective Patents  and Trademarks
and, subject to such  lien and security interest, each of  the Debtors expressly
retains full title to and ownership of its respective Patents and Trademarks.

          2.   The Debtors hereby  jointly and severally represent,  warrant and
covenant that:

               (a)  The Patents and Trademarks are subsisting and have not  been
     adjudged invalid or unenforceable, in whole or in part;

               (b)  To  the  best of  Debtors'  knowledge and  belief  after due
     inquiry, each of the Patents  and Trademarks is valid and  enforceable and,
     to the best of Debtors' knowledge, no material infringement or unauthorized
     use is presently being made of any Patents and Trademarks;

               (c)  Each of  the Debtors is the sole  and exclusive owner of the
     entire and unencumbered  right, title and  interest in and  to each of  its
     respective Patents and Trademarks, free and clear of any liens, charges and
     encumbrances,   including,   without  limitation,   pledges,   assignments,
     licenses, shop rights and covenants by Debtors not to sue third persons;

               (d)  Each of the Debtors has  the unqualified right to enter into
     this Agreement and perform its terms;

               (e)  Veeco's chief executive office is located at Terminal Drive,
     Plainview, New York  11803 and Sloan's chief executive office is located at
     602 East Montecito Street, Santa Barbara, California  93103; and

               (f)  Each of the Debtors has used, and will continue to use for
     the duration of this Agreement, consistent standards of quality, consistent
     with its past practices, in its manufacture of products sold under the
     Patents and Trademarks.

          3.   Each of the Debtors agrees that, until all of the Obligations
shall have been satisfied in full, it will not enter into any agreement which is
inconsistent with such Debtor's obligations under this Agreement, without
Agent's prior written consent.

          4.   If, before the Obligations shall have been satisfied in full
Debtors shall obtain rights to any new patentable inventions, or become entitled
to the benefit of any patent or trademark application or patent or trademark for
any reissue, division, continuation, renewal, extension, or continuation-in-part
of any patent or trademark or any improvement on the Patents 



                                      -2-



and Trademarks, the Debtors shall give to the Agent prompt notice thereof in
writing.  Notwithstanding the  foregoing, no provision of this Section 4 shall
obligate the Debtors to obtain patents or trademarks with respect to any such
rights or applications.

          5.   Debtors authorize Secured Parties to modify this Agreement by
amending Schedule A and Schedule B hereto to include any future patents and
patent applications and trademarks and trademark applications which are Patents
and Trademarks under paragraph 1 or paragraph 4 hereof.

          6.   If any Event of Default shall have occurred and be continuing,
Secured Parties shall have, in addition to all other rights and remedies given
them by this Agreement or the Security Agreement, those rights and remedies
allowed by law and the rights and remedies of a secured party under the Uniform
Commercial Code as enacted in any jurisdiction in which the Patents and
Trademarks may be located and, without limiting the generality of the foregoing,
the Secured Parties may immediately, upon 10 days' prior written notice during
which time, for purposes of this Agreement only, Debtors shall have an
opportunity to cure such Event of Default, sell at public or private sale or
otherwise realize upon, the whole or from time to time any part of the Patents
and Trademarks, or any interest which Debtors may have therein, and after
deducting from the proceeds of sale or other disposition of the Patents and
Trademarks all expenses (including all reasonable expenses for brokers' fees and
legal services), shall apply the residue of such proceeds toward the payment of
the Obligations.  Any remainder of the proceeds after payment in full of the
Obligations shall be paid over to the Debtors.

          7.   If any Event of Default shall have occurred and be continuing,
each of the Debtors hereby authorizes and empowers Secured Parties to make,
constitute and appoint any officer or agent of Secured Parties, as Secured
Parties may select in their exclusive discretion, as such Debtors' true and
lawful attorney-in-fact, with the power to endorse such Debtors' name on all
applications, documents, papers and instruments necessary for Secured Parties to
use the Patents and Trademarks, or to grant or issue any exclusive or
nonexclusive license under the Patents and Trademarks to any third person. Each
of the Debtors hereby ratifies all that such attorney shall lawfully do or cause
to be done by virtue hereof.  This power of attorney shall be irrevocable for
the life of this Agreement.

          8.   Any and all fees, costs and expenses, of whatever kind or nature,
including the reasonable attorneys' fees and disbursements incurred by Secured
Parties in connection with the preparation of this Agreement and all other
documents relating hereto and the consummation of this transaction, the filing
or recording of any documents (including all taxes in connection therewith) in
public offices, the payment or discharge of any taxes, counsel fees, maintenance
fees, encumbrances or otherwise protecting, maintaining or preserving the
Patents and Trademarks, or in defending or prosecuting any actions or
proceedings arising out of or related to the Patents and Trademarks, shall be
borne and paid by Debtors on demand by Secured Parties.

          9.   Each of the Debtors shall have the duty, until the Obligations
are paid in full to file and prosecute any and all continuations, continuations-
in-part, applications for reissue, applications for certificate of correction
and like matters, and to preserve and maintain all rights 





                                       -3-



in the Patents and Trademarks, including, without limitation, the payment of all
maintenance fees when due.  Any expenses incurred in connection with the
foregoing shall be borne by Debtors.  The Debtors shall not abandon any Patent
or Trademark, without the consent of Agent other than in the ordinary course of
their business if they determine that such Patent or Trademark is no longer
useful in the conduct of their business; provided, however, that under no
                                         --------
circumstances shall the Debtors abandon any Patent or Trademark listed on
Schedule A or B hereto, as such Schedules may be amended or supplemented from
time to time, without the prior written consent of the Agent.  The Debtors agree
that the Secured Parties shall have the right from time to time to include
additional Patents or Trademarks on Schedules A and B hereto if, after
consultation with the Debtors, the Secured Parties determine that such Patents
or Trademarks are particularly important to the conduct of the Debtor's
business.

          10.  Debtors shall use all reasonable efforts to detect any infringers
of rights described herein and shall advise Agent in writing of any material
infringements detected.  Secured Parties shall have the right to bring suit in
their name, and to join Debtors, if necessary, as a party to such suit, to
enforce the Patents and Trademarks and any licenses thereunder.  Debtors shall
promptly, upon demand, and without duplication of amounts required to be paid
pursuant to Section 8 hereof, reimburse and indemnify Secured Parties for all
damages, costs and expenses, including reasonably attorneys' fees and
disbursements, incurred by Secured Parties pursuant to this paragraph 10. 
Notwithstanding the foregoing, Secured Parties shall have no duties with respect
to the Patents and Trademarks, other than the duties expressly set forth herein,
and, without limiting the generality of the foregoing, shall have no duty to
prosecute any action for patent or trademark infringement.

          11.  Each of the Debtors hereby grants to Secured Parties and their
employees and agents the right to visit such Debtors' plants and facilities
which manufacture, inspect or store products sold under any of the trademarks
included in the Patents and Trademarks, and to inspect the products and quality
control records relating thereto at reasonable times during regular business
hours.  Debtors shall do any and all acts required by Secured Parties to ensure 
Debtors' compliance with paragraph 2(f) hereof.  Secured Parties agree to comply
in all respects with applicable governmental regulations in connection herewith.

          12.  All of Secured Parties' rights and remedies with respect to the
Patents and Trademarks, whether established hereby or by the Security Agreement,
or by any other agreements or by law shall be cumulative and may be exercised
singularly or concurrently. 

          13.  The provisions of this Agreement are severable, and if any clause
or provision shall be held invalid and unenforceable in whole or in part in any
jurisdiction, then such invalidity or unenforceability shall affect only such
clause or provision, or part thereof, in such jurisdiction, and shall not in any
manner affect such clause or provision in any other jurisdiction, or any clause
or provision of this Agreement in any jurisdiction. 

          14.  No course of dealing between Debtors and Secured Parties, nor any
failure to exercise, nor any delay in exercising, on the part of Secured
Parties, any right, power or privilege hereunder or under the Security Agreement
shall operate as a waiver thereof; nor shall




                                       -4-



any single or partial exercise of any right, power or privilege hereunder or
thereunder preclude any other or further exercise thereof or the exercise of any
other right, power or privilege. 

          15.  This Agreement is subject to modification only by a writing
signed by the parties, except as provided in paragraph 5. 

          16.  The benefits and burdens of this Agreement shall inure to the
benefit of and be binding upon the respective successors and permitted assigns
of the parties. 

          17.  The validity and interpretation of this Agreement and the rights
and obligations of the parties shall be governed by the laws of the State of New
York applicable to agreements made and to be wholly performed in the State of
New York. 

          18.  Notwithstanding anything herein or in the Agreement, the Agent
and the Secured Parties agree that upon the payment in full of the Obligations
(other than Obligations, including, without limitation, indemnities, which are
intended to survive the payment of the Loans and/or termination of the
commitments) and termination of the Commitments, (1) this Agreement shall
automatically terminate and be of no force or effect,, (2) all liens created
hereunder shall terminate, (3) the Agent shall promptly deliver and/or transfer
to the Debtors any and all Collateral in the Agent's or its representative's
possession and (4) the Agent shall execute and deliver to the Debtors such
documents and instruments as the Debtor shall reasonable request in order to
evidence the foregoing.






                                       -5-




          IN WITNESS WHEREOF, the execution hereof under seal as of the day and
year first above written.

                                        VEECO INSTRUMENTS INC.


      ATTEST-CORPORATE SEAL             By: /s/ John F. Rein, Jr.          
                                            ---------------------------- 
                                            Name:  John F. Rein, Jr.
      _________________________             Title:    Vice President


                                        SLOAN TECHNOLOGY CORPORATION


      ATTEST-CORPORATE SEAL             By: /s/ John F. Rein, Jr.           
                                            ----------------------------
                                            Name:  John F. Rein, Jr.
      _________________________             Title:    Vice President




     ACCEPTED:
     FLEET BANK, N.A.,
     AS AGENT


     By:/s/ William Ewing     
        -----------------------
     Name:   William Ewing
     Title:  Vice President    






                                       -6-








                                   SCHEDULE A
                                   ----------

                                     PATENTS
                                     -------


          Patent      Issued     Title
          ------      ------     -----
          4,184,188   15-Jan-80  Substrate   Clamping   Technique   in   IC
                                 Fabrication
          4,245,189   13-Jan-81  Probe Assembly for Measuring  Conductivity
                                 of Plated Through Holes
          4,343,092   10-Aug-82  Probe Guide and Holder
          4,646,341   24-Feb-87  Calibration Standard for X-Ray  Fluroscene
                                 Thickness
          4,669,300   2-Jun-87   Electromagnetic  Stylus  Force  Adjustment
                                 Mechanism
          4,778,561   18-Oct-88  Electron   Cyclotron    Resonance   Plasma
                                 Source;  Second  Magnetic Source  Enhances
                                 Output Uniformity
          4,833,402   23-May-89  Connector  Assembly  for a  Circuit  Board
                                 Testing Machine  and a Method of Testing a
                                 Circuit Board by Means of a Circuit
          4,949,783   21-Aug-90  Substrate Transport and Cooling  Apparatus
                                 and Method for Same
          5,042,949   27-Aug-91  Non-Contact Surface Profiler













                                   SCHEDULE B
                                   ----------

                                   TRADEMARKS
                                   ----------


          Mark              Registration No.      Registration Date
          ----              ----------------      -----------------

          Niceldermf        1,198,538             June 22, 1982

          UPA               1,161,735             July 21, 1981

          UPA               1,036,686             March 30, 1976

          Compuderm         1,049,434             October 5, 1976

          Sputtergun        1,025,030             November 11, 1975

          Veeco             796,722               September 28, 1965

          Dermitron         698, 109              May 24, 1960

          Veeco             619,030               January 10, 1956

          Microetch         1,736,138             December 1, 1992

          Dektak            1,860,766             November 1, 1994











                          CERTIFICATE OF ACKNOWLEDGMENT
                          -----------------------------

STATE OF NEW YORK   )
                    )    ss.:
COUNTY OF NASSAU    )

          Before  me, the  undersigned, a  Notary Public  in and for  the county
aforesaid, on this  31st day of  July, 1996, personally  appeared John F.  Rein,
Jr., to me known personally, and  who, being by me duly sworn, deposes  and says
that he  is the Vice  President of  Veeco Instruments  Inc., and  that the  seal
affixed to the  foregoing instrument is the corporate  seal of said corporation,
and that said instrument was signed and  sealed on behalf of said corporation by
authority  of its Board  of Directors, and  said John F.  Rein, Jr. acknowledged
said instrument to be the free act and deed of said corporation.



                                             /s/ Kathleen Verzi            
                                             ------------------------------
                                                      Notary Public

                                             My commission expires:

















                          CERTIFICATE OF ACKNOWLEDGMENT
                          -----------------------------

STATE OF NEW YORK   )
                    )    ss.:
COUNTY OF NASSAU    )

          Before  me, the  undersigned, a  Notary Public  in and for  the county
aforesaid, on this  31st day of  July, 1996, personally  appeared John F.  Rein,
Jr., to me known personally, and  who, being by me duly sworn, deposes  and says
that he is the Vice President of Sloan Technology Corporation, and that the seal
affixed to the  foregoing instrument is the corporate  seal of said corporation,
and that said instrument was signed and  sealed on behalf of said corporation by
authority  of its Board  of Directors, and  said John F.  Rein, Jr. acknowledged
said instrument to be the free act and deed of said corporation.



                                             /s/ Kathleen Verzi            
                                             ------------------------------
                                                      Notary Public

                                             My commission expires: