[GRAPHIC OMITTED]                                       Contacts: Rob Stewart
                                                              Investor Relations
FOR RELEASE                                                   Tel (626) 396-8300
- -----------                                                   Fax (626) 535-0344
November 13, 2001


                                 ACACIA RESEARCH
                      FILES THIRD QUARTER 10-Q WITH THE SEC
           WITH RETROACTIVE RECOGNITION OF TEN PERCENT STOCK DIVIDEND
                  DECLARED IN EARNINGS PER SHARE COMPUTATIONS


     PASADENA,  Calif. - (BUSINESS  WIRE) - November 13, 2001 - Acacia  Research
Corporation  (Nasdaq:ACRI)  today  filed  its Form  10-Q for the  quarter  ended
September  30, 2001 with the  Securities  and Exchange  Commission (the "SEC").

Pursuant to  Generally  Accepted  Accounting  Principles,  the  computations  of
earnings  per share for all periods  presented  in the third  quarter  Form 10-Q
filed,  give  retroactive  recognition  to the ten percent (10%) stock  dividend
declared by the  Company's  board of  directors  as  announced by the Company on
October 23, 2001.


     The table below compares  earnings per share as previously  reported in the
Company's  October 24, 2001 third quarter earnings press release to earnings per
share after  retroactive  recognition  of the 10% stock dividend for the periods
presented:




                                                                  Three Months Ended               Three Months Ended
                                                                  September 30, 2001               September 30, 2000
                                                               -------------------------         ------------------------

                                                            Prior to 10%          After 10%      Prior to 10%       After 10%
                                                           Stock Dividend       Stock Dividend   Stock Dividend   Stock Dividend
                                                              Declared            Declared         Declared         Declared
                                                              --------            --------         --------         --------
Loss per common share:
Basic and diluted
                                                                                                         
    Loss from continuing operations                          $(0.16)             $(0.14)            $(0.56)          $(0.51)
    Loss from discontinued operations                            -                    -              (0.13)           (0.12)
                                                           ----------            --------           -------          --------
                                                             $(0.16)             $(0.14)            $(0.69)          $(0.63)
                                                           ==========            ========           =======          =======

Weighted average number of common and potential common shares outstanding used
in computation of loss per share
    Basic and diluted                                      17,748,097            19,522,906        15,724,930       17,297,423
                                                           ==========            ==========        ==========       ==========



ABOUT ACACIA RESEARCH CORPORATION

Acacia  Research  develops  and operates  life  science and enabling  technology
companies.  The company's core technology opportunity has been developed through
its subsidiary,  CombiMatrix  Corporation.  Acacia Research intends to build and
acquire  companies  in the life science and  material  science  fields that will
utilize CombiMatrix's  biochip technology.  Acacia Research's website is located
at www.acaciaresearch.com.





Safe Harbor  Statement  under the Private  Securities  Litigation  Reform Act of
1995:

This news release contains forward-looking  statements within the meaning of the
"safe harbor"  provisions  of the Private  Securities  Litigation  Reform Act of
1995. These statements are based upon our current expectations and speak only as
of the date hereof.  Our actual results may differ materially and adversely from
those expressed in any forward-looking statements as a result of various factors
and uncertainties,  including the recent economic slowdown affecting  technology
companies,  our ability to successfully  develop products,  rapid  technological
change in our markets,  changes in demand for our future products,  legislative,
regulatory and competitive  developments  and general economic  conditions.  Our
Annual Report on Form 10-K,  recent and  forthcoming  Quarterly  Reports on Form
10-Q,  recent  Current  Reports  on Forms 8-K and 8-K/A,  and other SEC  filings
discuss some of the important risk factors that may affect our business, results
of operations and financial  condition.  We undertake no obligation to revise or
update publicly any forward-looking statements for any reason.