PLASMA & MATERIALS TECHNOLOGIES INC
SC 13G/A, 1997-02-12
SPECIAL INDUSTRY MACHINERY, NEC
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<PAGE>
 
                                                    ---------------------------
                                                           OMB APPROVAL        
                                                    ---------------------------
                                                    OMB NUMBER        3235-0145
                                                    EXPIRES:  DECEMBER 31, 1997
                                                    ESTIMATED AVERAGE BURDEN   
                                                    HOURS PER FORM........14.90
                                                    --------------------------- 

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                SCHEDULE 13G/A


                   Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*
 
                     Plasma & Materials Technologies, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)
 
                          Common Stock; No Par Value
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)
 
                                   72753M109
                ----------------------------------------------
                                (CUSIP Number)
 
 
 
 
 
 
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                                     Page 1
<PAGE>
 
                                 SCHEDULE 13G
 
- -----------------------                                               ----------
  CUSIP NO. 72753M109                                                   PAGE 2 
- -----------------------                                               ----------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Brentwood Associates V, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            Not applicable - see Item 4(a)
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          Not applicable - see Item 4(a)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             Not applicable - see Item 4(a)
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          Not applicable - see Item 4(a)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_]
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     Page 2
<PAGE>
 
                                 SCHEDULE 13G
 
- -----------------------                                               ----------
  CUSIP NO. 72753M109                                                   PAGE 3 
- -----------------------                                               ----------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Brentwood V Ventures, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            Not applicable - see Item 4(a)
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          Not applicable - see Item 4(a)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             Not applicable - see Item 4(a)
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          Not applicable - see Item 4(a)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_]
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     Page 3
<PAGE>
 
                                 SCHEDULE 13G
 
- -----------------------                                               ----------
  CUSIP NO. 72753M109                                                   PAGE 4 
- -----------------------                                               ----------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      G. Bradford Jones

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            Not applicable - see Item 4(a)
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          Not applicable - see Item 4(a)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             Not applicable - see Item 4(a)
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          Not applicable - see Item 4(a)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_]
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     Page 4
<PAGE>
 
                                 SCHEDULE 13G
 
- -----------------------                                               ----------
  CUSIP NO. 72753M109                                                   PAGE 5
- -----------------------                                               ----------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      David W. Chonette

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            Not applicable - see Item 4(a)
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          Not applicable - see Item 4(a)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             Not applicable - see Item 4(a)
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          Not applicable - see Item 4(a)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_]
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     Page 5
<PAGE>
 
                                 SCHEDULE 13G
 
- -----------------------                                               ----------
  CUSIP NO. 72753M109                                                   PAGE 6 
- -----------------------                                               ----------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Roger C. Davisson

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            Not applicable - see Item 4(a)
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          Not applicable - see Item 4(a)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             Not applicable - see Item 4(a)
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          Not applicable - see Item 4(a)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_]
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     Page 6
<PAGE>
 
                                 SCHEDULE 13G
 
- -----------------------                                               ----------
  CUSIP NO. 72753M109                                                   PAGE 7
- -----------------------                                               ----------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      John L. Walecka

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            Not applicable - see Item 4(a)
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          Not applicable - see Item 4(a)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             Not applicable - see Item 4(a)
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          Not applicable - see Item 4(a)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_]
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      Not applicable - see Item 4(a)

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     Page 7
<PAGE>
 
ITEM 1.

  (a)  NAME OF ISSUER

       Plasma & Materials Technologies, Inc.

  (b)  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

       9255 Deering Avenue
       Chatsworth, California  91311

ITEM 2.

  (a)  NAME OF PERSON FILING

       The persons filing this Schedule 13G/A are Brentwood Associates V, L.P.,
       a Delaware limited partnership ("Brentwood Associates"), Brentwood V
       Ventures, L.P., a Delaware limited partnership ("Brentwood Ventures"), G.
       Bradford Jones, David W. Chonette, Roger C. Davisson, and John L. Walecka
       (collectively the "Filing Persons").

       G. Bradford Jones, David W. Chonette, Roger C. Davisson, and John L.
       Walecka are each general partners of Brentwood Ventures, the general
       partner of Brentwood Associates.

  (b)  ADDRESS OF PRINCIPAL OFFICE

       11150 Santa Monica Blvd., Suite 1200
       Los Angeles, California 90025

  (c)  CITIZENSHIP

       The responses of the Filing Persons to Item 4 of the cover pages to this
       Schedule 13G/A that relate to the citizenships of such Filing Persons are
       herein incorporated by reference.

  (d)  TITLE OF CLASS OF SECURITIES
 
       This filing is made in regard to the Common Stock, no par value per
       share, of Plasma & Materials Technologies, Inc. (the "Common Stock").
 
  (e)  CUSIP NUMBER
 
       72753M109

ITEM 3.  IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b),
         CHECK WHETHER THE PERSON FILING IS A:
 
  (a)  [_]   Broker or Dealer registered under Section 15 of the Act
 
  (b)  [_]   Bank as defined in section 3(a)(6) of the Act
 
  (c)  [_]   Insurance Company as defined in section 3(a)(19) of the act
 
  (d)  [_]   Investment Company registered under section 8 of the Investment
             Company Act
 

                                     Page 8
<PAGE>
 
  (e)  [_]   Investment Adviser registered under section 203 of the Investment 
             Advisers Act of 1940

  (f)  [_]   Employee Benefit Plan, Pension Fund which is subject to the
             provisions of the Employee Retirement Income Security Act of 1974
             or Endowment Fund; see (S)240.13d-1(b)(1)(ii)(F)

  (g)  [_]   Parent Holding Company, in accordance with (S)240.13d-1(b)(ii)(G)
             (Note: See Item 7)

  (h)  [_]   Group, in accordance with (S)240.13d-1(b)(1)(ii)(H)

ITEM 4.  OWNERSHIP

  (a)  AMOUNT BENEFICIALLY OWNED

       Not applicable.  The percent of the class owned, as of December 31, 1996,
       does not exceed five percent.

  (b)  PERCENT OF CLASS

       Not applicable.

  (c)  NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS

       (i)   SOLE POWER TO VOTE OR TO DIRECT THE VOTE:  Not applicable.

       (ii)  SHARED POWER TO VOTE OR TO DIRECT THE VOTE:  Not applicable.

       (iii) SOLE POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF:  Not
             applicable.
  
       (iv)  SHARED POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF:  Not
             applicable.

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

  IF THIS STATEMENT IS BEING FILED TO REPORT THE FACT THAT AS OF THE DATE HEREOF
THE REPORTING PERSON HAS CEASED TO BE THE BENEFICIAL OWNER OF MORE THAN FIVE
PERCENT OF THE CLASS OF SECURITIES, CHECK THE FOLLOWING  [X]

ITEM 6.  OWNERSHIP OF MORE THAN FIVE 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

            The Filing Persons have filed this Schedule 13G/A as a group
            pursuant to Rule 13d-1(f). The identity of each member of the group
            is stated in an exhibit to the Schedule 13G amended hereby, filed
            with the Securities and Exchange Commission on February 14, 1996,
            which exhibit is incorporated herein by reference.

                                     Page 9
<PAGE>
 
            The Filing Persons entered into a Joint Reporting Agreement dated
            February 12, 1996 (the "Joint Reporting Agreement"), pursuant to
            which they agreed to file one joint statement on behalf of all of
            them with respect to the subject matter of this Schedule 13G/A. The
            Joint Reporting Agreement was filed with the Securities and Exchange
            Commission on February 14, 1996 as an exhibit to the Schedule 13G
            amended hereby, which exhibit is incorporated herein by reference.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP

            Not applicable.

ITEM 10. CERTIFICATION

  By signing below I certify that, to the best of my knowledge and belief, the
  securities referred to above were acquired in the ordinary course of business
  and were not acquired for the purpose of and do not have the effect of
  changing or influencing the control of the issuer of such securities and were
  not acquired in connection with or as a participant in any transaction having
  such purposes or effect.

                                    Page 10
<PAGE>
 
                                   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 7, 1997             BRENTWOOD ASSOCIATES V, L.P.
                                     a Delaware limited partnership

                                     By:  Brentwood V Ventures, L.P.
                                          a Delaware limited partnership
                                          Its:  General Partner


                                          By:   /s/ G. Bradford Jones
                                             ---------------------------------
                                             G. Bradford Jones,
                                             General Partner

                                     BRENTWOOD V VENTURES, L.P.,
                                     a Delaware limited partnership


                                     By:    /s/ G. Bradford Jones
                                          ------------------------------------
                                          G. Bradford Jones,
                                          General Partner

                                     /s/ G. Bradford Jones
                                     -----------------------------------------
                                     G. Bradford Jones


                                     /s/ G. Bradford Jones
                                     -----------------------------------------
                                     By:  G. Bradford Jones,
                                          Attorney-In-Fact*
                                     For: David W. Chonette


                                     /s/ G. Bradford Jones
                                     -----------------------------------------
                                     By:  G. Bradford Jones,
                                          Attorney-In-Fact*
                                     For: Roger C. Davisson


                                     /s/ G. Bradford Jones
                                     -----------------------------------------
                                     By:  G. Bradford Jones,
                                          Attorney-In-Fact*
                                     For: John L. Walecka


* The power of attorney pursuant to which G. Bradford Jones is signing in his
  capacity as an attorney-in-fact for such individual is attached hereto as an
  exhibit.

                                    Page 11
<PAGE>
 
                                 EXHIBIT INDEX
                                 -------------


<TABLE> 
<CAPTION> 
     Exhibit
     Number                    Description
     -------                   -----------
      <C>      <S> 

      1.       Identification of Members of the Group *

      2.       Joint Reporting Agreement dated February 8, 1996 *

      3.       Power of Attorney dated February 3, 1997 pursuant to which David
               W. Chonette appointed G. Bradford Jones, among others, his
               attorney-in-fact for certain filings with the Securities and
               Exchange Commission, including this Schedule 13G/A

      4.       Power of Attorney dated February 3, 1997 pursuant to which Roger
               C. Davisson appointed G. Bradford Jones, among others, his
               attorney-in-fact for certain filings with the Securities and
               Exchange Commission, including this Schedule 13G/A

      5.       Power of Attorney dated February 3, 1997 pursuant to which John
               L. Walecka appointed G. Bradford Jones, among others, his
               attorney-in-fact for certain filings with the Securities and
               Exchange Commission, including this Schedule 13G/A
</TABLE> 


* Filed with the Securities and Exchange Commission on February 14, 1996 as an
  exhibit to the Schedule 13G amended hereby.

                                    Page 12

<PAGE>
 
                                                                       EXHIBIT 3
                                                                       ---------


                               POWER OF ATTORNEY


    The undersigned, David W. Chonette, hereby makes, constitutes and appoints
G. Bradford Jones, Hilary G. Lottenberg and John L. Walecka the attorneys-in-
fact (individually, "Attorney"; and collectively, "Attorneys") of the
undersigned, with full power and authority, including without limitation the
power of substitution and resubstitution, acting together or separately, in the
name of and for and on behalf of the undersigned:

    (a) For the purpose of complying with the requirements of the Securities Act
of 1933, as amended, and the rules of the Securities and Exchange Commission
(the "Commission") thereunder (collectively, the "Securities Act"), and the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules
of the Commission thereunder collectively, the "Exchange Act"), to prepare or
cause to be prepared, execute, sign and file with the Commission and all
applicable securities exchanges and interdealer quotation systems on behalf of
the undersigned all statements, reports and other filings (including without
limitation amendments thereto) required to be filed by the undersigned under the
Securities Act or the Exchange Act, including without limitation all Schedules
13G, Schedules 13D and Initial Statements of Beneficial Ownership of Securities
on Commission Forms 3, 4 and 5 with respect to the equity securities of any
issuer of which a holder of equity securities is Brentwood Associates V, L.P.,
and

    (b) To make, execute, acknowledge, and deliver such other documents,
letters, and other writings, including communications to the Commission, and in
general to do all things and to take all actions, which any one or more of the
Attorneys in his, her or their sole discretion may consider necessary or proper
in connection with or to carry out the objective of complying with the
Securities Act and the Exchange Act,

as fully as could the undersigned if personally present and acting.

    Each of the Attorneys is hereby empowered to determine in his or her sole
discretion the time or times when, purpose for and manner in which any power
herein conferred upon him or her shall be exercised, and the conditions,
provisions, or other contents of any report, instrument or other document which
may be executed by him or her pursuant hereto.

    The undersigned hereby ratifies all that any one or more of the Attorneys or
his, her or their substitute or substitutes shall do under the authority of this
power of Attorney.

    Each Attorney shall have full power to make and substitute any other
attorney-in-fact in his or her place and stead.  The term "Attorney" shall
include the respective substitutes of any Attorney.

                                       1
<PAGE>
 
    This Power of Attorney shall remain in effect until 12:01 a.m. California
time on February 1, 2004, unless revoked in writing prior thereto. The
expiration of this Power of Attorney shall not affect any action taken by the
Attorneys prior to such expiration.

    This Power of Attorney shall be governed by the laws of California.

    IN WITNESS WHEREOF, the undersigned has duly executed this Power of Attorney
on this 3rd day of February, 1997.



                                  /s/ David W. Chonette
                                  ----------------------
                                  David W. Chonette

                                       2

<PAGE>
 
                                                                       EXHIBIT 4
                                                                       ---------

                               POWER OF ATTORNEY


    The undersigned, Roger C. Davisson, hereby makes, constitutes and appoints
G. Bradford Jones, Hilary G. Lottenberg and John L. Walecka the attorneys-in-
fact (individually, "Attorney"; and collectively, "Attorneys") of the
undersigned, with full power and authority, including without limitation the
power of substitution and resubstitution, acting together or separately, in the
name of and for and on behalf of the undersigned:

    (a) For the purpose of complying with the requirements of the Securities Act
of 1933, as amended, and the rules of the Securities and Exchange Commission
(the "Commission") thereunder (collectively, the "Securities Act"), and the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules
of the Commission thereunder collectively, the "Exchange Act"), to prepare or
cause to be prepared, execute, sign and file with the Commission and all
applicable securities exchanges and interdealer quotation systems on behalf of
the undersigned all statements, reports and other filings (including without
limitation amendments thereto) required to be filed by the undersigned under the
Securities Act or the Exchange Act, including without limitation all Schedules
13G, Schedules 13D and Initial Statements of Beneficial Ownership of Securities
on Commission Forms 3, 4 and 5 with respect to the equity securities of any
issuer of which a holder of equity securities is Brentwood Associates V, L.P.,
and

    (b) To make, execute, acknowledge, and deliver such other documents,
letters, and other writings, including communications to the Commission, and in
general to do all things and to take all actions, which any one or more of the
Attorneys in his, her or their sole discretion may consider necessary or proper
in connection with or to carry out the objective of complying with the
Securities Act and the Exchange Act,

as fully as could the undersigned if personally present and acting.

    Each of the Attorneys is hereby empowered to determine in his or her sole
discretion the time or times when, purpose for and manner in which any power
herein conferred upon him or her shall be exercised, and the conditions,
provisions, or other contents of any report, instrument or other document which
may be executed by him or her pursuant hereto.

    The undersigned hereby ratifies all that any one or more of the Attorneys or
his, her or their substitute or substitutes shall do under the authority of this
power of Attorney.

                                       1
<PAGE>
 
    Each Attorney shall have full power to make and substitute any other
attorney-in-fact in his or her place and stead. The term "Attorney" shall
include the respective substitutes of any Attorney.

    This Power of Attorney shall remain in effect until 12:01 a.m. California
time on February 1, 2004, unless revoked in writing prior thereto.  The
expiration of this Power of Attorney shall not affect any action taken by the
Attorneys prior to such expiration.

    This Power of Attorney shall be governed by the laws of California.

    IN WITNESS WHEREOF, the undersigned has duly executed this Power of Attorney
on this 3rd day of February, 1997.



                                  /s/ Roger C. Davisson
                                  ----------------------
                                  Roger C. Davisson

                                       2

<PAGE>
 
                                                                       EXHIBIT 5
                                                                       ---------


                               POWER OF ATTORNEY


    The undersigned, John L. Walecka, hereby makes, constitutes and appoints G.
Bradford Jones and Hilary G. Lottenberg the attorneys-in-fact (individually,
"Attorney"; and collectively, "Attorneys") of the undersigned, with full power
and authority, including without limitation the power of substitution and
resubstitution, acting together or separately, in the name of and for and on
behalf of the undersigned:

    (a) For the purpose of complying with the requirements of the Securities Act
of 1933, as amended, and the rules of the Securities and Exchange Commission
(the "Commission") thereunder (collectively, the "Securities Act"), and the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules
of the Commission thereunder collectively, the "Exchange Act"), to prepare or
cause to be prepared, execute, sign and file with the Commission and all
applicable securities exchanges and interdealer quotation systems on behalf of
the undersigned all statements, reports and other filings (including without
limitation amendments thereto) required to be filed by the undersigned under the
Securities Act or the Exchange Act, including without limitation all Schedules
13G, Schedules 13D and Initial Statements of Beneficial Ownership of Securities
on Commission Forms 3, 4 and 5 with respect to the equity securities of any
issuer of which a holder of equity securities is Brentwood Associates V, L.P.,
and

    (b) To make, execute, acknowledge, and deliver such other documents,
letters, and other writings, including communications to the Commission, and in
general to do all things and to take all actions, which any one or more of the
Attorneys in his, her or their sole discretion may consider necessary or proper
in connection with or to carry out the objective of complying with the
Securities Act and the Exchange Act,

as fully as could the undersigned if personally present and acting.

    Each of the Attorneys is hereby empowered to determine in his or her sole
discretion the time or times when, purpose for and manner in which any power
herein conferred upon him or her shall be exercised, and the conditions,
provisions, or other contents of any report, instrument or other document which
may be executed by him or her pursuant hereto.

    The undersigned hereby ratifies all that any one or more of the Attorneys or
his, her or their substitute or substitutes shall do under the authority of this
power of Attorney.

    Each Attorney shall have full power to make and substitute any other
attorney-in-fact in his or her place and stead.  The term "Attorney" shall
include the respective substitutes of any Attorney.

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<PAGE>
 
    This Power of Attorney shall remain in effect until 12:01 a.m. California
time on February 1, 2004, unless revoked in writing prior thereto.  The
expiration of this Power of Attorney shall not affect any action taken by the
Attorneys prior to such expiration.

    This Power of Attorney shall be governed by the laws of California.

    IN WITNESS WHEREOF, the undersigned has duly executed this Power of Attorney
on this 3rd day of February, 1997.



                                       /s/ John L. Walecka
                                      ---------------------
                                      John L. Walecka

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