SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G

                    Under the Securities Exchange Act of 1934

                              (Amendment No. _____)



                           Acacia Research Corporation
    ------------------------------------------------------------------------
                                (Name of Issuer)





               Acacia Research - Acacia Technologies Common Stock
    ------------------------------------------------------------------------
                         (Title of Class of Securities)





                                    003881307
    ------------------------------------------------------------------------
                                 (CUSIP Number)





                                December 31, 2003
    ------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)





Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

    [ ]  Rule 13d-1(b)
    [ ]  Rule 13d-1(c)
    [X]  Rule 13d-1(d)




CUSIP NO. 003881307

1.       Name of reporting persons.

         Paul R. Ryan

         I.R.S. Identification Nos. of above persons (entities only)

2.       Check the appropriate box if a member of a group

                  (a)    [ ]
                  (b)    [ ]

3.       SEC use only

4.       Citizenship or place of organization.

         United States

Number of shares beneficially owned by each reporting person with

         5.       Sole voting power

                  1,317,701(1)

         6.       Shared voting power

                  0

         7.       Sole dispositive power

                  1,317,701(1)

         8.       Shared dispositive power

                  0

9.       Aggregate amount beneficially owned by each reporting person

         1,317,701(1)

10.      Check if the aggregate amount in Row (9) excludes certain shares [ ]

11.      Percent of class represented by amount in Row 9

         6.4%

12.      Type of reporting person

         IN

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Item 1(a).    Name of issuer:

              Acacia Research Corporation

Item 1(b).    Address of issuer's principal executive offices:

              700 Newport Center Drive, 7th Floor
              Newport Beach, CA  92660

Item 2(a).    Names of person filing:

              Paul R. Ryan

Item 2(b).    Address of principal business office:

              700 Newport Center Drive, 7th Floor
              Newport Beach, CA  92660

Item 2(c).    Citizenship:

              United States

Item 2(d).    Title of class of securities:

              Acacia Research - Acacia Technologies Common Stock

Item 2(e).    CUSIP No.:

              003881307

Item 3.       If this statement is filed pursuant to Secs. 240.13d-1(b) or
              240.13d-2(b) or (c), check whether the person filing is a:

              Not Applicable

              (a)   [ ]     Broker or dealer registered under section 15 of the
                            Act (15 U.S.C. 78o);
              (b)   [ ]     Bank as defined in section 3(a)(6) of the Act (15
                            U.S.C. 78c);
              (c)   [ ]     Insurance company as defined in section 3(a)(19) of
                            the Act (15 U.S.C. 78c);
              (d)   [ ]     Investment company registered under section 8 of the
                            Investment Company Act of 1940 (15 U.S.C. 80a-8);
              (e)   [ ]     An investment adviser in accordance with Sec.
                            240.13d-1(b)(1)(ii)(E);
              (f)   [ ]     An employee benefit plan or endowment fund in
                            accordance with Sec. 240.13d-1(b)(1)(ii)(F);
              (g)   [ ]     A parent holding company or control person in
                            accordance with Sec. 240.13d-1(b)(ii)(G);
              (h)   [ ]     A savings association as defined in Section 3(b) of
                            the Federal Deposit Insurance Act (12 U.S.C. 1813);
              (i)   [ ]     A church plan that is excluded from the definition
                            of an investment company under section 3(c) (14) of
                            the Investment Company Act of 1940 (15 U.S.C.
                            80a-3);
              (j)   [ ]     Group, in accordance with Sec.
                            240.13d-1(b)(1)(ii)(J).

                                       3



Item 4.       Ownership

              (a)   Amount beneficially owned:

                    1,317,701(1)

              (b)   Percent of class:

                    6.4%

              (c)   Number of shares as to which the person has:

              (i)   Sole power to vote or to direct the vote:

                    1,317,701(1)

              (ii)  Shared power to vote or to direct the vote:

                    0

              (iii) Sole power to dispose or to direct the disposition of:

                    1,317,701(1)

              (iv)  Shared power to dispose or to direct the disposition of:

                    0


Item 5.       Ownership of 5 percent or Less of a Class

               Not Applicable

Item 6.       Ownership of More than 5 Percent on Behalf of Another Person

              Not Applicable

Item 7.       Identification and Classification of the Subsidiary Which Acquired
              the Security Being Reported on by the Parent Holding Company

              Not Applicable

Item 8.       Identification and Classification of Members of the Group

              Not Applicable

Item 9.       Notice of Dissolution of Group

              Not Applicable

Item 10.      Certifications

              Not Applicable

-----------------
(1)  Includes 876,714 shares of Acacia Research - Acacia Technologies Common
     Stock underlying stock options granted to Reporting Person which are
     currently exercisable or which become exercisable within 60 days of
     December 31, 2003.

                                       4



                                    Signature

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated: February 12, 2004

                                                /S/ Paul R. Ryan
                                                --------------------------------
                                                Signature

                                                Paul R. Ryan, Chairman and Chief
                                                Executive Officer
                                                --------------------------------
                                                Name/Title


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