Document:

Third Amendment to Rights Agreement

 Exhibit 4.6 
  
 THIRD AMENDMENT TO RIGHTS AGREEMENT 
  
 This Third Amendment, dated as of December 17, 2004 (“Amendment”), and effective as of the date set
forth below, amends that certain Rights Agreement, dated as of December 20, 1994 (“Rights Agreement”), as amended on August 14, 1996 (“First Amendment”) and December 11, 2000 (“Second Amendment,”
and together with the First Amendment, the “Former Amendments”), between RF Monolithics, Inc., a Delaware corporation (“Company”), and EquiServe Trust Company, N.A. (successor to Fleet National Bank)
(“Rights Agent”). 
  
 WHEREAS, the Company and
the Rights Agent entered into the Rights Agreement specifying the terms of the Rights (as defined therein); 
  
 WHEREAS, pursuant to Section 27 of the Rights Agreement, the Company desires to amend the Rights Agreement as set forth below; 
  
 WHEREAS, the Board of Directors of the Company has approved this Amendment.

  
 NOW, THEREFORE, in consideration of the premises and the
mutual agreements herein set forth, the parties hereby agree as follows: 
  
 Section 1. Certain Definitions. For purposes of this Amendment, capitalized terms not otherwise defined shall have the meaning given them in the Rights Agreement. 
  
 Section 2. Amendment. The Rights Agreement is hereby amended as
follows: 
  
 (a) Clause (ii) of Section 1(e) of the Rights
Agreement is hereby deleted in its entirety. 
  
 (b) Clause (i) of
Section 7(a) of the Rights Agreement is hereby amended by deleting “December 20, 2004” contained therein and inserting in lieu thereof “December 20, 2009.” 
  
 (c) The following sentence is hereby added to Section 21 of the Rights Agreement immediately following the end of the first
sentence thereof: 
  
 “In the event the transfer agency
relationship in effect between the Company and the Rights Agent terminates, the Rights Agent will be deemed to resign automatically on the effective date of such termination and any required notice will be sent by the Company.” 
  
 (d) The following Section 35 is hereby added to the Rights Agreement:

  
 “Section 35. Force Majeure. Notwithstanding
anything to the contrary contained herein, the Rights Agent shall not be liable for any delays or failures in performance resulting from acts beyond 

 its reasonable control including, without limitation, acts of God, terrorist acts, shortage of supply,
breakdowns or malfunctions, interruptions or malfunction of computer facilities, or loss of data due to power failures or mechanical difficulties with information storage or retrieval systems, labor difficulties, war, or civil unrest.”

  
 Section 3. Date of Effectiveness. This Amendment shall
be deemed effective as of December 17, 2004, as if executed by both parties hereto on such date. 
  
 Section 4. Effect of Amendment. Except as expressly amended hereby and by the Former Amendments, the Rights Agreement shall remain in full force
and effect. 
  
 Section 5. Severability. If any term,
provision, covenant or restriction of this Amendment is held by a court of competent jurisdiction or other authority to be invalid, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions of this Amendment shall
remain in full force and effect and shall in no way be affected, impaired or invalidated. 
  
 Section 6. Governing Law. This Amendment and each Right Certificate issued hereunder 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 the laws of such State applicable to contracts to be made and performed entirely within such State. 
  
 Section 7. Counterparts. This Amendment may be executed in any number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. 
  
 Section 8. 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. 
  

 2 

 IN WITNESS WHEREOF, parties hereto have caused this Amendment to be duly executed and effective as of the
date set forth above. 
  

			
	 RF MONOLITHICS, INC.

		
	 By:
	 	 /s/ David M. Kirk

	 	 	 David M. Kirk
 President and Chief Executive Officer

	
	 EQUISERVE TRUST COMPANY, N.A.

		
	 By:
	 	 /s/ Carol Mulvey-Eori

	 	 	 Carol Mulvey-Eori
 Managing Director

  

 3Waiver and Amendment No. 2 to Revolving/Term Credit and Security Agreement

 Exhibit 10.1 
  
 WAIVER AND AMENDMENT NO. 2 TO 
 REVOLVING/TERM CREDIT AND SECURITY AGREEMENT 
  
 THIS WAIVER AND AMENDMENT NO. 2 TO REVOLVING/TERM CREDIT AND SECURITY AGREEMENT (this “Waiver and Amendment”), dated as of December 14, 2004, is entered into by and among the financial institutions listed on
the signature pages hereof (individually, a “Lender” and collectively, the “Lenders”), UNION BANK OF CALIFORNIA, N.A., as Administrative Agent (in such capacity, the “Administrative Agent”), BROWN BROTHERS HARRIMAN
& CO., as Collateral Agent, and SERACARE LIFE SCIENCES, INC., a California corporation (the “Borrower”), with reference to the following facts: 
  
 RECITALS 
  
 A. The Borrower, the Lenders, the Administrative Agent and the Collateral Agent are parties to the Revolving/Term Credit and Security Agreement, dated as
of September 14, 2004, as amended by Amendment No. 1 to the Revolving/Term Credit and Security Agreement (the “Credit Agreement”), pursuant to which the Lenders have provided the Borrower with a revolving loan, term loan and letter of
credit facility. 
  
 B. An Event of Default (the “Existing
Event of Default”) has occurred and is continuing pursuant to Section 8(c) of the Credit Agreement due to Borrower’s failure to comply with Section 7.1(a) of the Credit Agreement. Due to a greater than anticipated allocation of the
purchase price for the Boston Biomedica acquisition to goodwill, the Effective Tangible Net Worth was reduced as of September 30, 2004 to $6,163,000. 
  
 C. The Borrower has requested that the Lenders waive the Existing Event of Default and revise the Credit Agreement as set forth herein, and the Lenders
are willing to do so on the terms set forth herein. 
  
 NOW,
THEREFORE, the parties hereby agree as follows: 
  
 1. Defined
Terms. Any and all initially capitalized terms used in this Waiver and Amendment (including, without limitation, in the recitals hereto) without definition shall have the respective meanings specified in the Credit Agreement. 
  
 2. Waiver of Existing Event of Default. Lenders hereby waive the
Existing Event of Default. Such waiver by Lenders shall constitute a waiver of only the Existing Event of Default and shall not constitute a waiver of any violation of Section 8 or Section 7.1 of the Credit Agreement other than the Existing Event of
Default. 
  

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 3. Reduction of Effective Tangible Net Worth Requirement. Section 7.1(a) of the Credit Agreement
is hereby amended to read in full as follows 
  
 (a) Effective
Tangible Net Worth. Permit Effective Tangible Net Worth, as of the end of any fiscal quarter of the Borrower, to be less than the sum of (i) $5,600,000, (ii) on a cumulative basis, on the date the Administrative Agent receives (or should
have received) the financial statements referred to in Section 5.1(b) with respect to any quarter (beginning with such statements delivered for the fiscal quarter ended December 31, 2004), 75% of the Net Income of the Borrower and the
Subsidiaries (disregarding any loss) in such fiscal quarter and (iii) on a cumulative basis, 100% of the Net Issuance Proceeds of any Equity Offering consummated by the Borrower or any Subsidiary during such fiscal quarter (excluding (1) the
approximately $8,200,000 Equity Offering consummated on the closing date of the Boston Biomedica Acquisition, and (2) any Equity Offering consummated prior to the Closing Date). 
  
 4. Waiver and Amendment Fee. In consideration of the Lenders’ agreement to waive the Existing Event of Default,
to enter into this Waiver and Amendment and to provide the Borrower with the accommodations described herein, on the effective date of this Waiver and Amendment, the Borrower shall pay to the Administrative Agent, for the ratable benefit of the
Lenders, a one-time fee of $5,000 (the “Waiver and Amendment Fee”). The Borrower acknowledges and agrees that, at the Administrative Agent’s option, the Administrative Agent may effect payment of the Waiver and Amendment Fee by
charging the full amount of such fee, when due, to the Borrower’s Revolving Loan account. 
  
 5. Condition Precedent. The effectiveness of this Waiver and Amendment shall be subject to the condition that the Administrative Agent shall have received a copy of this Waiver and Amendment, duly executed by
the Borrower, the Collateral Agent and each of the Lenders 
  
 6.
Miscellaneous. 
  

	 	(a)	Survival of Representations and Warranties. All representations and warranties made in the Credit Agreement or in any other document or documents relating thereto, including,
without limitation, any Loan Document furnished in connection with this Waiver and Amendment, shall survive the execution and delivery of this Waiver and Amendment 

  

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 and the other Loan Documents, and no investigation by the Administrative Agent or the Lenders or any
closing shall affect the representations and warranties or the right of the Administrative Agent or any Lender to rely thereon. 
  

	 	(b)	No Events of Default. Other than the Existing Event of Default waived hereby, the Borrower is not aware of any events which now constitute, or with the passage of time or the
giving of notice, or both, would constitute, an Event of Default under the Credit Agreement. 

  

	 	(c)	Reference to Credit Agreement. The Credit Agreement, each of the other Loan Documents, and any and all other agreements, documents or instruments now or hereafter executed
and delivered pursuant to the terms hereof, or pursuant to the terms of the Credit Agreement as amended hereby, are hereby amended so that any reference therein to the Credit Agreement shall mean a reference to the Credit Agreement as amended
hereby. 

  

	 	(d)	Credit Agreement Remains in Effect. The Credit Agreement and the other Loan Documents remain in full force and effect and the Borrower ratifies and confirms its agreements
and covenants contained therein. 

  

	 	(e)	Severability. Any provision of this Waiver and Amendment held by a court of competent jurisdiction to be invalid or unenforceable shall not impair or invalidate the remainder
of this Waiver and Amendment and the effect thereof shall be confined to the provision so held to be invalid or unenforceable. 

  

	 	(f)	APPLICABLE LAW. THIS WAIVER AND AMENDMENT AND ALL OTHER LOAN DOCUMENTS EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE IN THE STATE OF
CALIFORNIA AND SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF CALIFORNIA. 

  

	 	(g)	Successors and Assigns. This Waiver and Amendment is binding upon and shall inure to the benefit of the Lenders and the Borrower and their respective successors and assigns;
provided, however, that the Borrower may not assign or transfer any of its rights or obligations hereunder without the prior written consent of the Lenders. 

  

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	 	(h)	Counterparts. This Waiver and Amendment may be executed in one or more counterparts, each of which when so executed shall be deemed to be an original, but all of which when
taken together shall constitute one and the same instrument. 

  

	 	(i)	Headings. The headings, captions and arrangements used in this Waiver and Amendment are for convenience only and shall not affect the interpretation of this Waiver and
Amendment. 

  

	 	(j)	NO ORAL AGREEMENTS. THIS WAIVER AND AMENDMENT, TOGETHER WITH THE OTHER LOAN DOCUMENTS AS WRITTEN, REPRESENTS THE FINAL AGREEMENT BETWEEN THE LENDERS AND THE BORROWER AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE LENDERS AND THE BORROWER. 

  

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 IN WITNESS WHEREOF, the parties have entered into this Waiver and Amendment by their respective duly
authorized officers as of the date first above written. 
  

			
	SERACARE LIFE SCIENCES, INC.
		
	By:	 	 /s/ Tim T. Hart

	 	 	Tim T. Hart
	 	 	Chief Financial Officer
	
	 BROWN BROTHERS HARRIMAN & CO.,
 as the
Collateral Agent and a Lender

		
	By:	 	 /s/ Joseph E. Hall

	Name:	 	Joseph E. Hall
	Title:	 	Managing Director
	
	 UNION BANK OF CALIFORNIA, N.A.,
 as the
Administrative Agent and a Lender

		
	By:	 	 /s/ Douglas S. Lambell

	 	 	Douglas S. Lambell
	 	 	Vice President

  

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