Document:

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                                                                     EXHIBIT 4.1

COMMON STOCK                                             COMMON STOCK

NUMBER                                                   NUMBER

                               [LOGO OF LUMINEX]

                              LUMINEX CORPORATION

This certificate is transferable                             CUSIP 55027E 10 2
in New York, NY and Ridgefield, NJ                         SEE LEGENDS ON
                                                        REVERSE

This certifies that

is the owner of

FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $.001 PAR VALUE PER SHARE
OF

LUMINEX CORPORATION, incorporated under the laws of the state of Delaware,
transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this certificate properly
executed.  This certificate and the shares represented hereby are issued and
shall be held subject to all the provisions of the Restated Certificate of
Incorporation (copies of which are on file with the Transfer Agent).  This
certificate is not valid until countersigned by the Transfer Agent and
registered by the Registrar.

     Witness the signatures of its duly authorized officers.

Dated:
                                    Seal
/s/ Mark B. Chandler, President        Countersigned and Registered: ChaseMellon
/s/ Michael L. Bengtson, Secretary     Shareholder Services, L.L.C.
                                       Transfer Agent and Register

                                       By

                                       Authorized Signature
<PAGE>

LUMINEX CORPORATION

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM- as tenants in common            GIFT MIN ACT- _______ Custodian _______
TEN ENT- as tenant by the entireties                   (Cust)            (Minor)
JT TEN- as joint tenants with right of   Under the _____ Transfers to Minors Act
        survivorship and not as tenants           (State)
        in common

     Additional abbreviations may also be used though not in the above list.

     For value received, _______________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY NUMBER
OR OTHER IDENTIFYING NUMBER OF ASSIGNEE
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
________________________________________________________________________________
________________________________________________________________________________
common shares represented by the within Certificate, and do hereby irrevocably
constitute and appoint
________________________________________________________________________________
Attorney to transfer the said stock on the books of the within-named Corporation
with full power of substitution in the premises.

Dated _____________________

                                         X___________________________
                                              (Signature)
                                         X___________________________
                                              (Signature)

NOTICE: THE SIGNATURE(S) TO THIS  ASSIGNMENT
MUST CORRESPOND WITH THE NAME(S) AS WRITTEN
UPON THE FACE OF THIS CERTIFICATE IN EVERY PARTICULAR,
WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

This signature(s) must be guaranteed by an eligible guarantor institution
(Banks, Stockbrokers, Savings and Loan Associations and Credit Unions with
membership in an approved signature guarantee medallion program), pursuant to
S.E.C. rule 17Ag-15.<PAGE>

                                                                    EXHIBIT 10.2
                               FIRST AMENDMENT TO
                              AMENDED AND RESTATED
                           COOPER CAMERON CORPORATION
                            LONG-TERM INCENTIVE PLAN

     WHEREAS, COOPER CAMERON CORPORATION (the "Company") has heretofore adopted
the AMENDED AND RESTATED COOPER CAMERON CORPORATION LONG-TERM INCENTIVE PLAN
(the "Plan"); and

     WHEREAS, the Company desires to amend the Plan in certain respects;

     NOW, THEREFORE, the Plan shall be amended as follows, effective as of
February 12, 1998:

     1.  The number "11,000,000" shall be substituted for the number "8,000,000"
in the first and last sentences of Section 4.1 of the Plan.

     2.  The third sentence of Section 4.1 of the Plan shall be deleted and the
following shall be substituted therefor:

     "Common Stock related to Awards that are forfeited or terminated, expire
     unexercised, are settled in cash in lieu of Common Stock or in a manner
     such that all or some of the shares covered by an Award are not issued to a
     Participant (including where shares of Common Stock covered by an Award are
     used to satisfy tax withholding obligations pursuant to Section 15 of the
     Plan), or are exchanged for Awards that do not involve Common Stock, shall
     immediately become available for Awards hereunder."

     3.  The third sentence of Section 6.4 of the Plan shall be deleted and the
following shall be substituted therefor:

     "The Committee may provide in an Award Agreement respecting a stock option
     that, if a Participant pays the option exercise price in shares of Common
     Stock, upon the date of such payment a new option shall be granted and the
     number of shares of Common Stock subject to such new option shall be equal
     to the number of shares of Common Stock tendered in payment (plus the
     number of any shares of Common Stock respecting the exercised option
     retained to satisfy any tax withholding obligations); provided that such
     new option shall not be exercisable in any event after the original term of
     the exercised option."

     4.  As amended hereby, the Plan is specifically ratified and reaffirmed.

                                      /s/ Franklin Myers
                                     -----------------------------------------
                                     Franklin Myers, Senior Vice President,
                                       General Counsel & Secretary
                                     Date:  February 12, 1998<PAGE>

                                                                    EXHIBIT 10.3

                              SECOND AMENDMENT TO
                              AMENDED AND RESTATED
                           COOPER CAMERON CORPORATION
                            LONG-TERM INCENTIVE PLAN

     WHEREAS, COOPER CAMERON CORPORATION (the "Company") has heretofore adopted
the AMENDED AND RESTATED COOPER CAMERON CORPORATION LONG-TERM INCENTIVE PLAN
(the "Plan"); and

     WHEREAS, the Company desires to amend the Plan in certain respects;

     NOW, THEREFORE, the Plan shall be amended as follows, effective as of May
13, 1999:

1.   Section 14.3 shall be added to the Plan:

     "In addition to any other rights or privileges held by a holder with
     respect to an Award that is an option (including the provisions of
     Section 14.2), upon a Change in Control of the Company, the holder
     shall have the right to exchange such option for a new option ("New
     Option") that shall be issued according to the following:

     (1)  the New Option shall be immediately exercisable;

     (2)  the New Option shall have a term equal to the remaining term of the
          LTIP Option it replaces (and shall be exercisable through such term);

     (3)  the New Option will give the holder the right to acquire shares of the
          publicly traded common equity of the Company or any successor or
          direct or indirect parent of either ("Replacement Common Stock") (in
          the event of two or more classes of common equity, the common equity
          used shall be determined by the Compensation Committee of the Board of
          Directors of the Company existing prior to a Change in Control);

     (4)  the exercise price used for the New Option ("New Exercise Price") for
          acquiring a share of Replacement Common Stock shall be determined at
          the time of the Change in Control by taking (i) the higher of (a) the
          aggregate value (as of the date of the Change in Control) equal to the
          merger or acquisition consideration paid or payable in the Change in
          Control, on a per share basis, or (b) the highest
<PAGE>

          price paid for a share of Cooper Cameron common stock over the New
          York Stock Exchange (or other primary exchange) during the 12 months
          prior to the Change in Control, and (ii) dividing such amount into the
          per share exercise price of the LTIP Option; with the result
          multiplied by the Replacement Common Stock closing price on its
          principal stock exchange on the day of the Change in Control, or if
          traded in the over-the-counter market and not on an exchange, the last
          bid price in such market;

     (5)  the number of share of Replacement Common Stock subject to the New
          Option shall be the number necessary, using the New Exercise Price, to
          provide an aggregate value (as of the date of the Change in Control)
          equal to the higher of (a) the merger or acquisition consideration
          paid or payable in the Change in Control on a per share basis, or (b)
          the highest price paid for a share of Cooper Cameron common stock over
          the New York Stock Exchange (or other primary exchange) during the 12
          months prior to the Change in Control;

     (6)  if there is no publicly traded common equity of the Company, or any
          successor or any direct or indirect parent of either, then the New
          Option shall be with respect to shares of the direct or indirect
          parent of the Company, and if no such parent then the Company, and if
          the Company no longer exists, then the successor to the Company.

2.   Section 14.4 shall be added to the Plan:

     "The Board may determine, in connection with an event described in
     Sections 14.2 or 14.3, to provide with respect to Awards other
     adjustments, rights or privileges, including adjustments, rights or
     privileges that are alternatives to those provided in Sections 14.2
     and 14.3, but unless such adjustments, rights or privileges are
     cumulative to those in Sections 14.2 and 14.3, they will be applicable
     only with the consent of the holder of an Award.

3.   As amended hereby, the Plan is specifically ratified and reaffirmed.

                                      /s/ Franklin Myers
                                      ------------------------------
                                      Franklin Myers,
                                      Senior Vice President
                                         and Secretary
                                      Date:  May 13, 1999

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