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Exhibit 4.1    
  

 
 

AMENDMENT NO. 1 TO RIGHTS AGREEMENT    
  

        This Amendment No. 1 to Rights Agreement is made and entered into as of November 21, 2002 (this "Amendment"), between CoorsTek, Inc., a
Delaware corporation (the "Company"), and Wells Fargo Bank Minnesota, N.A., formerly known as Norwest Bank Minnesota, N.A. (the "Rights Agent"). 

Recitals  

        Whereas, the parties hereto desire to amend and restate in its entirety the definition of "Distribution Date" contained in Section 1 of the Rights
Agreement, dated as of December 20, 1999 (the "Rights Agreement"), between the Company and the Rights Agent (all capitalized terms used and not otherwise defined herein shall have the
respective meanings ascribed to such terms in the Rights Agreement). 

 
 

Agreement    
  

        NOW, THEREFORE, in consideration of the premises and the mutual agreements set forth herein and in the Rights Agreement, the parties hereby agree as follows: 

        1.    Amendment to Section 1.    The definition of "Distribution Date" contained in
Section 1(i) of the Rights Agreement is hereby amended and restated to read in its entirety as follows: 

        "
(i) "Distribution Date" shall mean the earlier of (i) the Close of Business on the tenth day after the Stock Acquisition Date (or, if the tenth day after the Stock Acquisition
Date occurs before the Record Date, the close of business on the Record Date), as such period may be extended or shortened in the discretion of the Board, or (ii) the Close of Business on the
tenth Business Day (or, if such tenth
Business Day occurs before the Record Date, the Close of Business on the Record Date), or such specified or unspecified later date on or after the Record Date as may be determined by action of the
Board, after the date that a tender or exchange offer by any Person (other than the Company, any Subsidiary of the Company or any employee benefit plan of the Company or of any Subsidiary of the
Company or any Person or entity holding shares of Common Stock for or pursuant to the terms of any such plan) is first published or sent or given within the meaning of Rule 14d-2(a)
of the General Rules and Regulations under the Exchange Act, if upon consummation thereof, such Person would be the beneficial owner of 15% or more of the outstanding shares of Common Stock." 

        2.    Effect of Amendment.    Except as and to the extent expressly modified by this Amendment, the Rights Agreement
shall remain in full force and effect in all respects. 

        3.    Counterparts.    This Amendment may be executed in any number of counterparts. It shall not be necessary that
the signature of or on behalf of each party appears on each counterpart, but it shall be sufficient that the signature of or on behalf of each party appears on one or more of the counterparts. All
counterparts shall collectively constitute a single agreement. It shall not be necessary in any proof of this Amendment to produce or account for more than a number of counterparts containing the
respective signatures of or on behalf of all of the parties. 

        4.    Governing Law.    This Amendment shall be deemed to be a contract made under the laws of the State of Delaware
and for all purposes shall be governed by and construed in accordance with laws of such State. 

        5.    Descriptive Headings.    Descriptive headings of the several Sections of this Amendment are inserted for
convenience only and shall not control or affect the meaning or construction of any of the provisions hereof. 

        (The
Remainder of This Page is Intentionally Left Blank.) 

 

        IN
WITNESS WHEREOF, the parties have caused this Amendment to be executed as of the date first written above by their respective officers thereunto duly authorized. 

	 	 	COORSTEK, INC.
	

 	
 	

By:	
 	

/s/  JOSEPH G. WARREN, JR.      

	 	 	Name:	 	Joseph G. Warren, Jr.
	 	 	Title:	 	Chief Financial Officer, Vice President, Secretary and Treasurer
	

 	
 	

WELLS FARGO BANK MINNESOTA, N.A.
	

 	
 	

By:	
 	

/s/  BARBARA M. NOVAK      

	 	 	Name:	 	Barbara M. Novak
	 	 	Title:	 	Vice President

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Exhibit 4.1

AMENDMENT NO. 1 TO RIGHTS AGREEMENT

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Exhibit 4.2    
  

AMENDMENT NO. 2 TO RIGHTS AGREEMENT  

        This Amendment No. 2 to Rights Agreement is made and entered into as of December 22, 2002 (this "Amendment"), between CoorsTek, Inc., a
Delaware corporation (the "Company"), and Wells Fargo Bank Minnesota, N.A. (the "Rights Agent"). 

Recitals  

        WHEREAS, the Company and the Rights Agent are parties to that certain Rights Agreement dated December 20, 1999, as amended by Amendment No. 1 to
Rights Agreement dated November 21, 2002, each between the Company and the Rights Agent (as amended, the "Rights Agreement"), which specifies the terms of the Rights (as such term, and each
other term used and not otherwise defined herein, is defined in the Rights Agreement); and 

        WHEREAS,
the Company and the Rights Agent desire to amend the Rights Agreement pursuant to Section 27 of the Rights Agreement as set forth herein. 

Agreement  

        NOW, THEREFORE, in consideration of the premises and the mutual agreements set forth herein and in the Rights Agreement, the parties hereby agree as follows: 

        1.    Amendment to Section 1(a).    Section 1(a) of the Rights Agreement is hereby amended by
adding the following sentence at the end of such Section: 

        "Notwithstanding
anything to the contrary contained in this Agreement, none of Keystone Holdings LLC, a Delaware limited liability company ("Parent"), Keystone Acquisition Corp., a
Delaware corporation and wholly owned subsidiary of Parent ("Purchaser"), and their Affiliates and Associates shall be deemed to be an Acquiring Person by virtue of (i) the execution, delivery
or performance of the Agreement and Plan of Merger, dated as of December 22, 2002, by and among the Company, Parent and Purchaser (the "Merger Agreement", which term shall include any
amendments thereto), (ii) the acquisition of shares of Common Stock of the Company pursuant to the Merger (as defined in the Merger Agreement), (iii) the consummation of the Merger, or
(iv) the consummation of any of the transactions contemplated by the Merger Agreement." 

        2.    Amendment to Section 1(i).    Section 1(i) of the Rights Agreement is hereby amended by
adding the following sentence at the end of such Section: 

        "Notwithstanding
anything to the contrary contained in this Agreement, a Distribution Date shall not occur or be deemed to occur as a result of (i) the execution, delivery or
performance of the Merger Agreement; (ii) the acquisition of shares of Common Stock of the Company pursuant to the Merger, (iii) the consummation of the Merger, or (iv) the
consummation of any of the transactions contemplated by the Merger Agreement." 

        3.    Amendment to Section 1(y).    Section 1(y) of the Rights Agreement is hereby amended by adding the
following sentence at the end of such Section: 

        "Notwithstanding
anything to the contrary contained in this Agreement, a Stock Acquisition Date shall not occur or be deemed to occur as a result of (i) the public announcement of
the Merger or the Merger Agreement, (ii) the execution, delivery or performance of the Merger Agreement, (iii) the acquisition of shares of Common Stock of the Company pursuant to the
Merger, (iv) the consummation of the Merger, or (v) the consummation of any of the transactions contemplated by the Merger Agreement." 

 

        4.    Amendment to Section 7(a).    Section 7(a) of the Rights Agreement is hereby amended to
read in its entirety as follows: 

        "(a) Subject
to Section 7(e) hereof, the registered holder of any Rights Certificate may exercise the Rights evidenced thereby (except as otherwise provided herein
including, without limitation, the restrictions on exercisability set forth in Section 9(c), Section 11(a)(iii) and Section 23(a) hereof) in whole or in part at any time
after the Distribution Date upon surrender of the Rights Certificate, with the form of election to purchase and the certificate on the reverse side thereof duly executed, to the Rights Agent at the
principal office of the Rights Agent, together with payment of the Purchase Price for each one one-thousandth of a share of Preferred Stock (or other securities, cash or other assets, as
the case may be) as to which the Rights are exercised, at or prior to the earlier of (i) the close of business on January 1, 2010 (the "Final Expiration Date"), (ii) the time at
which the Rights are redeemed as provided in Section 23 hereof, (iii) the time at which such Rights are exchanged (the "Exchange Date") as provided in Section 24 hereof,
(iv) the time at which the Rights expire pursuant to Section 13(d) hereof, or (v) immediately prior to the Effective Time (as defined in the Merger Agreement) of the Merger (the
earliest of (i), (ii), (iii), (iv) and (v) being herein referred to as the "Expiration Date")." 

        5.    Amendment to Section 13.    Section 13 of the Rights Agreement is hereby amended by adding the
following sentence at the end of such Section as a new paragraph (e): 

        "(e) Notwithstanding
anything to the contrary contained in this Agreement, the Merger shall not constitute a Section 13 Event." 

        6.    Amendment to Create New Section 35.    The Rights Agreement is hereby amended by adding a new
Section 35 immediately after Section 34 to read in its entirety as follows: 

 "Section 35. Extensions.  

        Notwithstanding
anything to the contrary contained in this Agreement, (A) the period referred to in clause (a)(i) of Section 23 of this Agreement is hereby
extended until the earlier to occur of (i) the Effective Time of the Merger and (ii) the tenth day after the first date of public announcement that the Merger Agreement has been
terminated, or such later or earlier date as the Board may determine, and (B) a Distribution Date under this Agreement shall not occur prior to the earlier to occur of (x) the Effective
Time of the Merger and (y) the tenth day after the first date of public announcement that the Merger Agreement has been terminated, or such later or earlier date as the Board may determine." 

2

 

        7.    Effect of Amendment.    Except as and to the extent expressly modified by this Amendment, the Rights Agreement
shall remain in full force and effect in all respects. 

        8.    Counterparts.    This Amendment may be executed in any number of counterparts. It shall not be necessary that
the signature of or on behalf of each party appears on each counterpart, but it shall be sufficient that the signature of or on behalf of each party appears on one or more of the counterparts. All
counterparts shall collectively constitute a single agreement. It shall not be necessary in any proof of this Amendment to produce or account for more than a number of counterparts containing the
respective signatures of or on behalf of all of the parties. 

        9.    Governing Law.    This Amendment shall be deemed to be a contract made under the laws of the State of Delaware
and for all purposes shall be governed by and construed in accordance with laws of such State. 

        10.    Descriptive Headings.    Descriptive headings of the several Sections of this Amendment are inserted for
convenience only and shall not control or affect the meaning or construction of any of the provisions hereof. 

(The
Remainder of This Page is Intentionally Left Blank.) 

3

 

        IN
WITNESS WHEREOF, the parties have caused this Amendment to be executed as of the date first written above by their respective officers thereunto duly authorized. 

	

 	
 	

COORSTEK, INC.
	

 	
 	

By:	
 	

/s/  JOSEPH G. WARREN, JR.      

	 	 	Name:	 	Joseph G. Warren, Jr.
	 	 	Title:	 	Chief Financial Officer, Vice President, Secretary and Treasurer
	

 	
 	

WELLS FARGO BANK MINNESOTA, N.A.
	

 	
 	

By:	
 	

/s/  BARBARA M. NOVAK      

	 	 	Name:	 	Barbara M. Novak
	 	 	Title:	 	Vice President

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QuickLinks

Exhibit 4.2

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