ENAMELON INC
8-K, 1998-04-14
MISC HEALTH & ALLIED SERVICES, NEC
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C. 20549

                                   FORM 8-K

                                CURRENT REPORT

                        Pursuant to Section 13 or 15(d)
                    of the Securities Exchange Act of 1934

        Date of Report (Date of earliest event reported): April 6, 1998
                                                          -------------

                                ENAMELON, INC.
                              -----------------
            (Exact name of registrant as specified in its charter)

        Delaware                       0-21595                13-3669775
      -----------                     ---------              ------------
(State or Other Jurisdiction  (Commission File Number) (IRS Employer Ident. No.)
   of Incorporation)

                  15 Kimball Avenue, Yonkers, New York 10704
          -----------------------------------------------------------
              (Address of Principal Executive Offices) (Zip Code)


                                (914) 237-1308
                        -----------------------------
              Registrant's telephone number, including area code
<PAGE>
 
Item 5.   Other Events.
          ------------

          On April 6, 1998, the Registrant finalized an Amendment to Restated
Patent Licence Agreement (the "U.S. Amendment") and an Amendment to Restated
Foreign Patent License Agreement (the "Foreign Amendment") with the American
Dental Association Health Foundation (the "ADAHF"), both of which are effective
as of January 1, 1998. The U.S. Amendment amends the Restated Patent License
Agreement, dated as of June 24, 1992, as amended by the Amendment Agreement
dated as of June 12, 1995 (together, the "License Agreement"), and the Foreign
Amendment amends the Restated Foreign Patent License Agreement, dated as of
November 18, 1992, as amended by the Foreign License Amendment Agreement, dated
as of June 14, 1995 (together, the "Foreign License Agreement").

          The License Agreement, as amended by the U.S. Amendment (the "Amended
License Agreement"), grants the Registrant a fully-paid exclusive United States
license to manufacture and sell toothpastes and chewing gum and other food and
confectionery products ("Exclusive Products") using certain ADAHF patents issued
in the United States (the "ADAHF Patented Technology"). Under the Amended
License Agreement, the Registrant will be required to pay a fixed annual royalty
through 2008 of $400,000 with respect to all sales by the Registrant of
Exclusive Products (whether or not they rely upon the ADAHF Patented Technology)
up to $100 million in that year and an additional fixed royalty of $200,000 with
respect to all sales by the Registrant of Exclusive Products exceeding $100
million in that year. The term of the Amended License Agreement expires upon the
last to expire of the ADAHF patents licensed under the Amended License
Agreement, including any continuations, divisions, reexaminations, extensions or
releases thereof.

          The Foreign License Agreement, as amended by the Foreign Amendment
(the "Amended Foreign License Agreement"), grants the Registrant a fully-paid
exclusive license to manufacture and sell Exclusive Products using technology
that is the subject matter of foreign patent applications filed by the ADAHF in
certain foreign countries. It also grants the Registrant the non-exclusive right
to manufacture and sell in such countries other products using that technology,
including oral sprays, mouth rinses and professional gels ("Non-Exclusive
Products"). The Amended Foreign License Agreement provides that the Registrant's
payment of royalties under the Amended License Agreement will constitute a
fully-paid license under the Amended Foreign License Agreement with respect to
sales of the Exclusive Products. The royalties payable with respect to sales of
Non-Exclusive Products and other provisions of the Foreign License Agreement
pertaining to Non-Exclusive Products remain unchanged under the Amended Foreign
License Agreement.

          The U.S. Amendment and the Foreign Amendment each provides that the
Registrant may assign or sublicense its rights under its licenses with respect
to the Exclusive Products without the consent of the ADAHF, provided that the
Registrant will continue to remain liable for payment of royalties under the
Amended License Agreement. In addition, the ADAHF has waived any claim to
ownership rights in any of the Registrant's patents, and the Registrant has
agreed not to sue the ADAHF or any licensee of the ADAHF licensed to use the
ADAHF patents for infringement of the Registrant's patents, unless the
infringement constitutes a breach of the Registrant's exclusive license under
the two license agreements.

          (c)      Exhibits.

                   10.1     Restated Patent License Agreement by and between the
                            Registrant and the American Dental Association
                            Health Foundation dated as of June 24, 1992.(1)

                   10.2     Amendment Agreement by and between the Registrant
                            and the American Dental Association Health
                            Foundation dated as of June 12, 1995.(1)

                   10.3     Amendment to Restated Patent License Agreement
                            between the Registrant and the American Dental
                            Association Health Foundation dated as of January 1,
                            1998.

                                      -2-
<PAGE>
 
                   10.4     Restated Foreign Patent License Agreement by and
                            between the Registrant and the American Dental
                            Association Health Foundation dated as of November
                            18, 1992.(1)

                   10.5     Foreign License Amendment Agreement by and between
                            the Registrant and the American Dental Association
                            Health Foundation dated as of June 14, 1995.(1)

                   10.6     Amendment to Restated Foreign Patent License
                            Agreement between the Registrant and the American
                            Dental Association Health Foundation dated as of
                            January 1, 1998.

                   (1)      Incorporated herein by reference from Exhibits to
                            Registrant's Registration Statement on Form S-1
                            (File No. 333-06455), declared effective on October
                            24, 1996.

                                      -3-
<PAGE>
 
                                    SIGNATURE
                                    ---------

          Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                              ENAMELON, INC.              
                                                   (Registrant)           
                                                                          
Date: April 14, 1998                          By:  /s/ Dr. Steven R. Fox
                                                   -----------------------------
                                                   Dr. Steven R. Fox      
                                                   Chief Executive Officer 



                                      -4-
<PAGE>
 
                                  EXHIBIT INDEX

Exhibit No.        Description    
- -----------        -----------

10.1      Restated Patent License Agreement by and between the Registrant and
          the American Dental Association Health Foundation dated as of June 24,
          1992.(1)

10.2      Amendment Agreement by and between the Registrant and the American
          Dental Association Health Foundation dated as of June 12, 1995.(1)

10.3      Amendment to Restated Patent License Agreement between the Registrant
          and the American Dental Association Health Foundation dated as of
          January 1, 1998.

10.4      Restated Foreign Patent License Agreement by and between the
          Registrant and the American Dental Association Health Foundation dated
          as of November 18, 1992.(1)

10.5      Foreign License Amendment Agreement by and between the Registrant and
          the American Dental Association Health Foundation dated as of June 14,
          1995.(1)

10.6      Amendment to Restated Foreign Patent License Agreement between the
          Registrant and the American Dental Association Health Foundation dated
          as of January 1, 1998.

(1)       Incorporated herein by reference from Exhibits to Registrant's
          Registration Statement on Form S-1 (File No. 333-06455), declared
          effective on October 24, 1996.


                                      -5-

<PAGE>







                                 EXHIBIT 10.3

                AMENDMENT TO RESTATED PATENT LICENSE AGREEMENT
<PAGE>
 
                AMENDMENT TO RESTATED PATENT LICENSE AGREEMENT

        Amendment to Restated Patent License Agreement ("Amendment"), dated as
of January 1, 1998, between Enamelon, Inc., a Delaware corporation (the
"LICENSEE"), and the American Dental Association Health Foundation, a
not-for-profit corporation organized under the law of Illinois (the "LICENSOR").

                            Preliminary Statements
                            ----------------------

        WHEREAS, the LICENSOR and the LICENSEE heretofore entered into a
Restated Patent License Agreement, as amended by the Amendment Agreement, dated
as of June 12, 1995, copies of which are appended hereto as Exhibit A (together,
the "PLA"); and

        WHEREAS, the LICENSOR and the LICENSEE desire to amend and clarify the
terms and conditions of the PLA for the purpose, inter alia, of simplification
of recording, accounting and making royalty payments;

        In consideration of the foregoing and the mutual covenants in this
Amendment, the parties hereto hereby agree as follows:

        Section 1. The first sentence of Article I, Section 1 of the PLA is
        ---------
hereby amended to read in its entirety as follows:

               1. LICENSOR hereby grants and agrees to grant to LICENSEE, for
        the term of the U.S. PATENT FILINGS, an exclusive license, with a right
        to sublicense, throughout the United States and the territories thereof,
        to make, have made, sell, use, induce use of and/or contribute to use of
        the INVENTIONS for use in dentifrices (including toothpastes, tooth
        cleaning gels and tooth cleaning powders), confections, foods and
        chewing gums only (collectively, "EXCLUSIVE PRODUCTS"), subject to those
        rights granted under the GOVERNMENT LICENSES, and subject to those
        rights retained by LICENSOR in the following paragraphs and the
        unrestricted right of LICENSOR to grant other licenses for other types
        of products ("EXCLUSIVE LICENSE").

        Section 2. Article I, Section 1 of the PLA is hereby amended by deleting
        ---------
all sentences after the first sentence.

        Section 3. Article I, Section 2 of the PLA is hereby amended by deleting
        ---------
the last sentence of such Section.

        Section 4. Article I of the PLA is hereby amended by deleting Sections 3
        ---------
and 5 thereof and renumbering Section 4 as Section 3 and Section 6 as Section 4.
<PAGE>
 
        Section 5.     Article II, Section 1 of the PLA is hereby amended to
        ---------
read in its entirety as follows:

               1. In consideration of a fully-paid EXCLUSIVE LICENSE, LICENSEE
        shall pay LICENSOR, commencing with the calendar year 1998 and for each
        calendar year thereafter through and including the calendar year 2008, a
        ROYALTY equal to the aggregate amount of Four Million Four Hundred
        Thousand Dollars ($4,400,000.00) and, if applicable, up to an additional
        maximum of Two Million Two Hundred Thousand Dollars ($2,200,000.00) in
        accordance with the following schedule:

        Four Hundred Thousand Dollars ($400,000.00) per calendar year with
        respect to all of LICENSEE'S SALES OF EXCLUSIVE PRODUCTS in such
        calendar year up to One Hundred Million Dollars, such annual payment to
        be disbursed to LICENSOR in equal quarterly installments on or before
        the last day of March, June, September and December of each calendar
        year; and

        An additional payment of Two Hundred Thousand Dollars ($200,000.00) per
        calendar year with respect to all of LICENSEE'S SALES OF EXCLUSIVE
        PRODUCTS in such calendar year exceeding One Hundred Million Dollars
        ($100,000,000.00), if any, such additional payment to be disbursed to
        LICENSOR on or before the last day of January of the subsequent calendar
        year.

        Section 6. Article II of the PLA is hereby amended to delete Section 2
        ---------
thereof and to renumber Sections 3 and 4 thereof as Sections 2 and 3.

        Section 7. Article II, Section 3 of the PLA (as renumbered pursuant to
        ---------
Section 6 hereof) is hereby amended to read in its entirety as follows:

               3. "SALES OF EXCLUSIVE PRODUCTS" shall mean the total annual
        sales of EXCLUSIVE PRODUCTS by the Company, domestic and foreign, as
        reported by the Company in its audited annual financial statements or,
        if not separately reported, as determined by the Company in accordance
        with generally accepted accounting principles and certified by the
        Company's auditors. Such sales of EXCLUSIVE PRODUCTS shall include all
        sales of EXCLUSIVE PRODUCTS, whether patented or unpatented and whether
        specifically licensed by LICENSOR hereunder or not, but shall not
        include sales of mouthwashes, other oral care products, and other items
        or products not included in the term EXCLUSIVE PRODUCTS as defined in
        this Agreement.
<PAGE>
 
        Section 8.     Article II, Sections 5 through 9 of the PLA are hereby 
        ---------
deleted in their entirety.


        Section 9.     Article III, Section 2 of the PLA is hereby amended in 
        ---------
its entirety to read as follows:

               2. LICENSEE agrees that on or before the last day of January of
        each year commencing on January 31, 1999, and ending on January 31,
        2009, it will furnish LICENSOR with a written statement specifying the
        amount of its net sales during the preceding year.

        Section 10. The third sentence of Article V, Section 1 of the PLA is
        ----------
hereby amended in its entirety to read as follows:

        If LICENSOR deems legal action to be necessary, LICENSEE shall assist
        LICENSOR in said legal action at LICENSOR'S expense, and LICENSOR shall
        take reasonable steps to keep LICENSEE advised of the progress of the
        lawsuit.

        Section 11.    Article VIII, Section 2 of the PLA is hereby amended in
        ----------
its entirety to read as follows:

               2. Any FIELD DEVELOPMENTS which are made by LICENSOR alone and
        which are patentable shall be licensed to LICENSEE under the terms of
        this Agreement, and no additional ROYALTY shall be due with respect
        thereto.

        Section 12. The last two sentences of Article VIII, Section 3 of the PLA
        ----------
are hereby deleted and the following sentence is hereby added to the end of such
Section:

        This free license may be assigned, transferred or sublicensed by
        LICENSEE in its sole discretion.

        Section 13. Article VIII of the PLA is hereby amended by adding thereto
        ----------
a new Section 7, which shall read in its entirety as follows:

               7. In further consideration of the covenants and undertakings by
        LICENSEE, LICENSOR waives any and all claim to ownership rights in the
        following U.S. patents and patent applications and any continuations,
        divisions, reissues, re-examinations and corresponding foreign patents
        and applications thereof:

               U.S. Patent No. 5,571,502
               U.S. Patent No. 5,605,675
               U.S. Patent No. 5,603,922
               U.S. Patent No. 5,645,853
               U.S. Patent No. 5,628,429
               U.S. Patent No. 5,614,175
<PAGE>
 
        Notwithstanding the foregoing, LICENSEE covenants not to sue LICENSOR or
        any licensee of LICENSOR licensed to make, have made, sell, use, induce
        use of and/or contribute to use of the INVENTIONS for infringement of
        the aforesaid patents unless the conduct of said LICENSOR or any such
        licensee of LICENSOR constitutes a breach of the EXCLUSIVE LICENSE.
        Further, LICENSEE covenants not to sue LICENSOR with respect to the
        aforesaid patents for manufacture and use for research and testing
        purposes, including laboratory research and clinical trials.

        Section 14.    Article IX, Section 1 of the PLA is amended in its 
        ----------
entirety to read as follows:


               1. To protect the rights of privacy and/or publicity of
        LICENSOR'S inventors, assignors, employees, officers and directors; to
        protect the trademark and trade name rights of LICENSOR and its
        affiliates; to prevent confusion regarding sponsorship of any given
        product or technique of LICENSEE; and to preclude imposition of any
        warranty, guarantee or other liability or potential liability upon
        LICENSOR, its employees, assignors, affiliates, officers, and directors;
        LICENSEE agrees that aside from (1) the patent notice provided for by 34
        U.S.C. section 287, (2) any rights which may be conferred by
        certification of a product by an affiliate of LICENSOR, (3) disclosures
        concerning this Agreement or the INVENTIONS, MATERIALS or UNITS required
        by law, or (4) an express prior written consent of LICENSOR, LICENSEE
        will not use the name of any employee, assignor, officer or director or
        the business name or identification or LICENSOR or its affiliates, or
        use any certification mark of LICENSOR or its affiliates, in advertising
        or promotional materials, educational materials, publications, fliers,
        brochures and other public descriptions relating to UNIT(S) and/or
        MATERIAL(S).

        Section 15. Article IX, Section 3 of the PLA is hereby deleted in its
        ----------
entirety and Sections 4 through 7 thereof are hereby renumbered as Sections 3
through 6.

        Section 16. Article IX, Section 5 of the PLA (as renumbered pursuant to
        ----------
Section 15 hereof) is hereby amended in its entirety to read as follows:

               5. This AGREEMENT shall inure to the benefit of and will be
        binding upon LICENSOR and LICENSEE, and their respective successors and
        assigns. No assignment of this AGREEMENT, however, shall relieve
        LICENSEE of the obligation to pay, or cause to be paid, ROYALTIES to
        LICENSOR under this AGREEMENT.

        Section 17. The terms "this Agreement," "hereof," "hereunder," and words
        ----------
of like meaning appearing in the PLA shall mean and refer to the PLA as amended
hereby.

        Section 18. Except as otherwise amended by this Amendment, the PLA shall
        ----------
remain in full force and effect, and LICENSOR and LICENSEE hereby reaffirm each
of their respective agreements, covenants and obligations set forth therein.
<PAGE>
 
        IN WITNESS WHEREOF, the undersigned have caused this Amendment to be
executed by their duly authorized officers as of the date first above written.

                                    ENAMELON, INC.                        
                                                                          
                                    By:   /s/Dr. Steven R. Fox            
                                       ---------------------------------- 
                                           Dr. Steven R. Fox, Chairman    
                                                                          
                                    AMERICAN DENTAL ASSOCIATION           
                                           HEALTH FOUNDATION              
                                                                          
                                    By:   /s/Dr. John S. Zapp             
                                       ---------------------------------- 
                                           Dr. John S. Zapp               
                                                                          
                                    Title:    Executive Director          
                                          -------------------------------  

<PAGE>
 






                                 EXHIBIT 10.6

            AMENDMENT TO RESTATED FOREIGN PATENT LICENSE AGREEMENT
<PAGE>
 
AMENDMENT TO RESTATED FOREIGN PATENT LICENSE AGREEMENT

        Amendment to Restated Foreign Patent License Agreement ("Amendment"),
dated as of January 1, 1998, between Enamelon, Inc., a Delaware corporation (the
"LICENSEE"), and the American Dental Association Health Foundation, a
not-for-profit corporation organized under the law of Illinois (the "LICENSOR").

                            Preliminary Statements
                            ----------------------

        WHEREAS, the LICENSOR and the LICENSEE heretofore entered into a
Restated Foreign Patent License Agreement, dated from the 18th day of November
1992, as amended by the Foreign License Amendment Agreement, dated as of June
14, 1995, copies of which are appended hereto as Exhibit A (together the "FPLA
"); and

        WHEREAS, the LICENSOR and the LICENSEE desire to amend and clarify the
terms and conditions of the FPLA for the purpose, inter alia, of simplification
                                                  ----- ----
of recording, accounting and making royalty payments;

        In consideration of the foregoing and the mutual covenants in this
Amendment, the parties hereto hereby agree as follows:

        Section 1.     Article II, Section 1 of the FPLA is hereby amended to
        ---------
read in its entirety as follows:

               1. LICENSOR hereby grants and agrees to grant to LICENSEE, during
        the term of this Agreement, a license under the above-identified FOREIGN
        APPLICATIONS and FOREIGN PATENTS within the LICENSED TERRITORY, to make,
        have made, sell, use, induce use of and/or contribute to use of the
        INVENTIONS subject to those rights that have been or will be granted to
        the United States government by licenses in the form of Exhibit B, and
        countervailing requirements of applicable foreign law. In the fields of
        dentifrices (including toothpastes, tooth cleaning gels and tooth
        cleaning powders), confections, foods and chewing gums (collectively,
        "EXCLUSIVE PRODUCTS"), LICENSEE'S license shall be exclusive to the
        extent permitted by law in each of the LICENSED TERRITORIES, except that
        LICENSOR retains at all times for itself and its RELATED COMPANIES for
        research and testing purposes, including laboratory research and
        clinical trials, but not the right to commercially sell or use the
        INVENTIONS in the EXCLUSIVELY LICENSED FIELDS. In all fields of the
        INVENTIONS other than the EXCLUSIVELY LICENSED FIELDS, the license
        granted hereunder shall be non-exclusive.
<PAGE>
 
        Section 2.     Article II, Section 2 of the FPLA is hereby amended to
        ---------
read in its entirety as follows:

               2. The license hereunder with respect to the NON-EXCLUSIVELY
        LICENSED FIELDS shall not be assigned, transferred or sublicensed by
        LICENSEE except with the prior written consent of LICENSOR. Such
        permission shall not be unreasonably withheld by LICENSOR. LICENSEE
        shall have the right to assign, transfer or sublicense the license
        hereunder with respect to the EXCLUSIVELY LICENSED FIELDS in its
        absolute discretion.

        Section 3. Article II, Section 3 of the FPLA is hereby amended by
        ---------
deleting the first sentence and the first five words of the second sentence of
such Section.

        Section 4.     Article II, Section 8 of the FPLA is hereby amended in
        ---------
its entirety to read as follows:

               8. LICENSOR hereby grants LICENSEE an option and right of first
        refusal for a limited license under future patents and applications for
        INVENTIONS and MATERIAL for all territories not within the LICENSED
        TERRITORIES or the United States or its territories or possessions. The
        option and right of first refusal hereunder are also limited in that
        they apply only in the EXCLUSIVELY LICENSED FIELDS. Before licensing
        another party in any territory other than the LICENSED TERRITORIES or
        the United States under future patents or patent applications for
        EXCLUSIVE PRODUCTS embodying MATERIAL, LICENSOR shall provide LICENSEE
        with written notice of its intention to pursue license negotiations.
        Within thirty (30) days of receipt of the notice, LICENSEE must exercise
        its option and right of first refusal hereunder. If LICENSEE chooses to
        accept a license with respect to a territory, other than the LICENSED
        TERRITORIES or the United States, it will do so under the terms of this
        Agreement. LICENSEE may exercise its option to obtain a license from
        LICENSOR on the same terms as this Agreement for a territory or
        territories other than the LICENSED TERRITORIES and the United States at
        any time during the life of the FOREIGN APPLICATIONS or FOREIGN PATENTS
        issued thereunder, assuming that LICENSOR has not granted an exclusive
        license for the territory after LICENSEE'S failure to exercise its right
        of first refusal hereunder.
<PAGE>
 
        Section 5.     Article III, Section 1 of the FPLA is hereby amended to
        ---------
 read in its entirety as follows:

               1. The payment by LICENSEE of royalties under the Restated Patent
        License Agreement, dated from the 24th day of June 1992, between
        LICENSOR and LICENSEE, as amended by the Amendment Agreement, dated as
        of June 12, 1995, and the Amendment to Restated Patent License
        Agreement, dated as of January 1, 1998 (such Restated Patent License
        Agreement, as amended, being referred to herein as the "PLA"), shall be
        in consideration of a fully-paid license hereunder with respect to the
        EXCLUSIVELY LICENSED FIELDS, including, without limitation, all licenses
        in the EXCLUSIVELY LICENSED FIELDS in the territories licensed pursuant
        to Section 8 of Article II hereof. In consideration of the license
        hereunder with respect to the NON-EXCLUSIVELY LICENSED FIELDS, LICENSEE
        agrees to pay to LICENSOR a quarterly royalty payment of 7% of the basis
        specified hereinafter, payable for each CALENDAR QUARTER within one
        month after the end of that CALENDAR QUARTER; provided, however, that
        the quarterly royalty payment payable by LICENSEE to LICENSOR with
        respect to the NON- EXCLUSIVELY LICENSED FIELDS in connection with net
        sales corresponding to UNITS made, sold, used or otherwise disposed of
        by a JOINT VENTURE shall be 4%. Anything in this Agreement to the
        contrary notwithstanding, the provisions of Sections 2, 3, 4, 5, 7, and
        9 of Article III hereof and Sectiuon 4 of Article IV hereof shall apply
        only to the license granted hereunder with respect to the NON-
        EXCLUSIVELY LICENSED FIELDS, and the provisions of the PLA with respect
        to the calculation and payment of royalties shall apply in all respects
        to the license granted hereunder with respect to the EXCLUSIVELY
        LICENSED FIELDS.

        Section 6. Article IV, Section 1of the FPLA is hereby amended to read in
        ---------
its entirety as follows:

               1. Unless terminated as herein provided, this AGREEMENT shall
        extend (a) until the PLA terminates; or (b) until the expiration of the
        last to expire of any FOREIGN PATENT licensed hereunder; or (c) until
        LICENSOR abandons or permits to lapse all FOREIGN APPLICATIONS and
        FOREIGN PATENTS licensed hereunder, whichever comes first. In the case
        of abandonment or lapse, LICENSOR will promptly notify LICENSEE of the
        pertinent abandonment or lapse.

        Section 7. The third sentence of Article V, Section 1 of the FPLA is
        ---------
hereby amended in its entirety to read as follows:

        If LICENSOR deems legal action to be necessary, LICENSEE shall assist
        LICENSOR in said legal action at LICENSOR'S expense, and LICENSOR shall
        take reasonable steps to keep LICENSEE advised of the progress of the
        lawsuit.
<PAGE>
 
        Section 8.     Article VII, Section 2 of the FPLA is hereby amended in 
        ---------
its entirety to read as follows:

               2. Any FIELD DEVELOPMENTS which are made by LICENSOR alone and
        which are patentable shall be licensed to LICENSEE under the terms of
        this Agreement, and no additional ROYALTY shall be due with respect
        thereto.

        Section 9. The last two sentences of Article VII, Section 3 of the FPLA
        ---------
are hereby deleted and the following is hereby inserted in lieu thereof:

        This free license with respect to the EXCLUSIVELY LICENSED FIELDS may be
        assigned, transferred or sublicensed by LICENSEE in its sole discretion.
        This free license with respect to the NON-EXCLUSIVELY LICENSED FIELDS
        shall not be assigned, transferred or sublicensed by LICENSEE except
        with the prior express written consent of LICENSOR. Such permission
        shall be granted or withheld at the sole option of LICENSOR.

        Section 10. Article VII of the FPLA is hereby amended by adding thereto
        ----------
a new Section 7, which shall read in its entirety as follows:

               7. In further consideration of the covenants and undertakings by
        LICENSEE, LICENSOR waives any and all claim to ownership rights in the
        following U.S. patents and patent applications and any continuations,
        divisions, reissues, re-examinations and corresponding foreign patents
        and applications thereof:

               U.S. Patent No. 5,571,502
               U.S. Patent No. 5,605,675
               U.S. Patent No. 5,603,922
               U.S. Patent No. 5,645,853
               U.S. Patent No. 5,628,429
               U.S. Patent No. 5,614,175

        Notwithstanding the foregoing, LICENSEE covenants not to sue LICENSOR or
        any licensee of LICENSOR licensed to make, have made, sell, use, induce
        use of and/or contribute to use of the INVENTIONS for infringement of
        the aforesaid patents unless the conduct of said LICENSOR or any such
        licensee of LICENSOR constitutes a breach of the license hereunder with
        respect to the EXCLUSIVELY LICENSED FIELDS. Further, LICENSEE covenants
        not to sue LICENSOR with respect to the aforesaid patents for
        manufacture and use for research and testing purposes, including
        laboratory research and clinical trials.
<PAGE>
 
        Section 11.    Article VIII, Section 1 of the FPLA is amended in its 
        ----------
entirety to read as follows:

               1. To protect the rights of privacy and/or publicity of
        LICENSOR'S inventors, assignors, employees, officers and directors; to
        protect the trademark and trade name rights of LICENSOR and its
        affiliates; to prevent confusion regarding sponsorship of any given
        product or technique of LICENSEE; and to preclude imposition of any
        warranty, guarantee or other liability or potential liability upon
        LICENSOR, its employees, assignors, affiliates, officers, and directors;
        LICENSEE agrees that aside from (1) the patent notice provided for by 34
        U.S.C. section 287, (2) any rights which may be conferred by
        certification of a product by an affiliate of LICENSOR, (3) disclosures
        concerning this Agreement or the INVENTIONS, MATERIALS or UNITS required
        by law, or (4) an express prior written consent of LICENSOR, LICENSEE
        will not use the name of any employee, assignor, officer or director or
        the business name or identification or LICENSOR or its affiliates, or
        use any certification mark of LICENSOR or its affiliates, in advertising
        or promotional materials, educational materials, publications, fliers,
        brochures and other public descriptions relating to UNIT(S) and/or
        MATERIAL(S).

        Section 12.    Article VIII, Section 5 of the FPLA is hereby amended in
        ----------
 its entirety to read as follows:

               5. This AGREEMENT shall inure to the benefit of and will be
        binding upon LICENSOR and LICENSEE, and their respective successors and
        assigns. The license under this AGREEMENT with respect to the
        NON-EXCLUSIVELY LICENSED FIELDS shall not be assignable without the
        prior written permission of LICENSOR, except that LICENSEE may assign
        such license to any other company in which LICENSEE or Dr. Steven R. Fox
        owns more than 50% of the voting stock. Written permission of LICENSOR
        for other assignments of the license with respect to the NON-EXCLUSIVELY
        LICENSED FIELDS will not be unreasonably withheld.

        Section 13. The terms "this Agreement," "hereof," "hereunder," and words
        ----------
of like meaning appearing in the FPLA shall mean and refer to the FPLA as
amended hereby.

        Section 14. Except as otherwise amended by this Amendment, the FPLA
        ----------
shall remain in full force and effect, and LICENSOR and LICENSEE hereby reaffirm
each of their respective agreements, covenants and obligations set forth
therein.
<PAGE>
 
        IN WITNESS WHEREOF, the undersigned have caused this Amendment to be
executed by their duly authorized officers as of the date first above written.

                                          ENAMELON, INC.                       
                                                                               
                                        By:   /s/Dr. Steven R. Fox             
                                           ------------------------------------
                                               Dr. Steven R. Fox, Chairman     
                                                                               
                                        AMERICAN DENTAL ASSOCIATION            
                                               HEALTH FOUNDATION               
                                                                               
                                        By:   /s/Dr. John S. Zapp              
                                           ------------------------------------
                                               Dr. John S. Zapp                
                                                                               
                                        Title:    Executive Director           
                                              --------------------------------- 


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