Document:

Service agreement between Exponent, Inc. and Exponent Engineering P.C

 Exhibit 10.20 
 SERVICES AGREEMENT 
 This Services Agreement (this “Agreement”) is entered into as of
January 6, 2006 by and between Exponent, Inc, a Delaware corporation (“Exponent”), and Exponent Engineering, P.C., a California professional corporation (“Exponent Engineering”). 
 BACKGROUND 
 A. Exponent Engineering
is a California professional corporation engaged in professional engineering, is qualified to do business in the State of New York, and has available to it the services of professional engineers licensed to provide professional engineering services
in the State of New York. 
 B. Exponent desires to obtain from Exponent Engineering, on the terms and conditions set forth herein, certain
professional engineering services, and Exponent Engineering is willing to provide to Exponent, on the terms and conditions set forth herein, such services. 
 AGREEMENT 
 NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements
set forth herein, Exponent Engineering and Exponent hereby agree as follows: 
  

	1.	ARTICLE I.        SERVICES 

 1.1. Professional Engineering Services. Exponent Engineering shall undertake to provide professional engineering services from time to time to clients of Exponent, or clients introduced to Exponent Engineering
by Exponent, when and as reasonably requested by Exponent (collectively, the “Services”). All such Services shall be performed in accordance with applicable professional standards and any related laws, rules or regulations, and any
applicable policies and procedures of Exponent. 
 1.2. Provision of Exponent Employees and Resources. Exponent shall make available
to Exponent Engineering such employees (the “Employees”) and any and all other resources, including without limitation financial and administrative resources, of Exponent as may be necessary to perform the engagements described in
Section 1.1 and to provide any professional engineering services so secured, in addition to any other services incident to the operation of the business of Exponent Engineering conducted in accordance with this Agreement (collectively, the
“Support”). The Employees providing the Support may be designated Exponent Engineering titles consistent with the Support provided by such Employees. 
 1.3. Consideration. In consideration for the provision of the Support as set forth in Section 1.2 above, any and all amounts or other consideration received by Exponent Engineering in connection with the
Services or the operation of its business shall belong to Exponent, and shall be delivered by Exponent Engineering to Exponent promptly upon receipt. 

 1.4. Operation of Business of Exponent Engineering. All activity undertaken by Exponent
Engineering in connection with the operation of its business shall be consistent with this Agreement. 
  

	2.	ARTICLE II.        INTELLECTUAL PROPERTY RIGHTS 

 2.1. Assignment of Ownership Of Work Product.  
 (a) Work Product. “Work Product” means all deliverables, inventions, innovations, improvements, or other works of authorship Exponent Engineering, whether through the Employees or otherwise, may
conceive or develop in the course of the operation of its business, whether or not they are eligible for patent, copyright, trademark, trade secret, or other legal protection. 
 (b) Assignment. Exponent Engineering acknowledges that all Work Product is the sole and exclusive property of Exponent. Exponent Engineering
hereby assigns, transfers and conveys to Exponent all right, title and interest in and to the Work Product, including without limitation, all related worldwide patents, patent applications, copyrights, trademarks, trade secrets, rights of
reproduction, and any and all other rights of whatever kind or nature. Any assignment, transfer or conveyance pursuant to the immediately prior sentence with respect to any project undertaken by Exponent Engineering hereunder shall be effective upon
the completion or termination of such project. Exponent Engineering agrees to execute such further documents and to perform such further acts, at Exponent’s expense, as may be necessary to perfect the foregoing assignment and to protect
Exponent’s rights in the Work Product. In the event Exponent Engineering fails or refuses to execute such documents, Exponent Engineering hereby appoints Exponent as Exponent Engineering’s attorney-in-fact (this appointment to be
irrevocable and a power coupled with an interest) to act on Exponent Engineering’s behalf and to execute such documents. 
  

	3.	ARTICLE III.        INDEMNIFICATION 

 Exponent shall indemnify Exponent Engineering and hold Exponent Engineering and its officers, directors and shareholders harmless from any and all claims, demands, causes of action, losses, damages, liabilities, costs
and expenses, including attorneys’ fees arising from or relating to the provision of the Services or the operation of the business of Exponent Engineering in accordance with this Agreement. All rights to indemnification and advancement of
expenses of any such officer, director or shareholder of Exponent Engineering pursuant to the certificate of incorporation or bylaws of Exponent, or any indemnification agreement between any such officer, director or shareholder and Exponent, shall
be applicable to the Services and the operation of the business of Exponent Engineering. The officers, directors and stockholders of Exponent Engineering shall be third party beneficiaries of this Article III. 
  

	4.	ARTICLE IV.        TERM AND TERMINATION 

 4.1. Term. This Agreement shall remain in full force and effect until such time as it may be terminated by Exponent pursuant to Section 4.2 below. 
  

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 4.2. Termination. This Agreement may be terminated immediately by Exponent upon written notice to
Exponent Engineering. 
 4.3. Survival. The provisions of Articles II, III and IV of this Agreement shall survive any termination of
this Agreement. 
  

	5.	ARTICLE V.        MISCELLANEOUS 

 5.1. Assignment. This Agreement shall be binding upon and inure to the benefit of the successors and assigns of the parties. Exponent may assign, in whole or in part and to one or more third parties, any of its
rights or obligations under this Agreement. Exponent Engineering shall not assign any of its rights or obligations under this Agreement without the prior written consent of Exponent. 
 5.2. Notices. Any notice or other communication required or permitted hereunder shall be in writing and shall be deemed to have been duly given on
the date of service if served personally, by recognized expedited delivery service, or by facsimile (with confirmation copies of any facsimile notice to be provided by at least one other method of delivery permitted hereunder), or five (5) days
after the date of mailing if mailed, by first class mail, registered or certified, postage prepaid. Notices shall be addressed as follows: 
 To Exponent or Exponent Engineering at: 
 Exponent, Inc. 
 149 Commonwealth Drive 
 Menlo Park, CA 94025 
 Attn: Chief Financial Officer 
 or to such other address as a party has designated by notice in writing to the other party in the manner provided by this Section. 
 5.3. Entire Agreement and Modification. This Agreement constitutes and contains the entire agreement of the parties and supersedes any and all
prior negotiations, correspondence, understandings and agreements between the parties respecting the subject matter hereof. This Agreement may only be amended by written instrument signed by the parties. Article III shall not be amended or modified
without the prior written consent of each officer, director and shareholder of Exponent Engineering. 
 5.4. Governing Law. This
Agreement shall be governed by and construed in accordance with the laws of the State of California applicable to contracts entered into and wholly to be performed in the State of California by California residents. The parties hereby waive trial by
jury in connection with any action or suit under this Agreement or otherwise arising from the relationship between the parties hereto. 
 5.5. Severability. If any provision of this Agreement is held to be invalid, illegal or incapable of being enforced by any law or public policy, all other terms and provisions of this Agreement shall nevertheless remain in full force
and effect so long as the economic or legal substance of the transactions contemplated hereby is not affected in any manner materially adverse to any party. Upon such determination that any term or other provision is invalid, illegal or incapable of
being enforced, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect the original intent of the parties as closely as possible in an acceptable manner in order that the transactions contemplated hereby are
consummated as originally contemplated to the greatest extent possible. 
 5.6. Headings. The headings appearing at the beginning of
several sections contained herein have been inserted for the convenience of the parties and shall not be used to determine the construction or interpretation of this Agreement. 
  

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 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed as of the date first
above set forth. 
  

			
	Exponent, Inc.
		
	By:	 	 /s/ Richard L. Schlenker

	Name:	 	Richard L. Schlenker
	Title:	 	Chief Financial Officer
	
	Exponent Engineering, P.C.
		
	By:	 	 /s/ John Osteraas

	Name:	 	John Osteraas
	Title:	 	Vice President & Secretary

  

 4Registrant's 2004 Equity Incentive Plan

 Exhibit 10.20 
 CoTherix, Inc. 2004 Equity Incentive Plan 
 Notice of Stock Option Grant 
 You have been granted the following option to purchase shares of the Common Stock of CoTherix, Inc. (the “Company”): 
  

	 Name of Optionee: 
	 «Name» 

  

	 Total Number of Shares: 
	 «TotalShares» 

  

	 Type of Option: 
	 «ISO» Incentive Stock Option 

  

	 	 «NSO» Nonstatutory Stock Option 

  

	 Exercise Price Per Share: 
	 $«PricePerShare» 

  

	 Date of Grant: 
	 «DateGrant» 

  

	 Vesting Commencement Date: 
	 «VestDay» 

  

	 Vesting Schedule: 
	 This option becomes exercisable with respect to the first 25% of the Shares subject to this option when you complete 12 months of continuous
“Service” (as defined in the Plan) from the Vesting Commencement Date. Thereafter, this option becomes exercisable with respect to an additional 2.08333% of the Shares subject to this option when you complete each month of Service.

  

	 Expiration Date: 
	 «ExpDate». This option expires earlier if your Service terminates earlier, as described in the Stock Option Agreement.

 You and the Company agree that this option is granted under and governed by the terms and conditions of the 2004 Equity Incentive Plan
(the “Plan”) and the Stock Option Agreement, both of which are attached to and made a part of this document. 
 You further agree that the Company
may deliver by email all documents relating to the Plan or this option (including, without limitation, prospectuses required by the Securities and Exchange Commission) and all other documents that the Company is required to deliver to its security
holders (including, without limitation, annual reports and proxy statements). You also agree that the Company may deliver these documents by posting them on a web site maintained by the Company or by a third party under contract with the Company. If
the Company posts these documents on a web site, it will notify you by email. 
  

			
	Optionee:	 	CoTherix, Inc.
		
		 	 By:   

		
		 	 Title:

  

 CoTherix, Inc. 2004 Equity Incentive Plan 
 Stock Option Agreement 
  

			
	Tax Treatment	  	This option is intended to be an incentive stock option under section 422 of the Internal Revenue Code or a nonstatutory stock option, as provided in the Notice of Stock Option
Grant.
		
	Vesting	  	This option becomes exercisable in installments, as shown in the Notice of Stock Option Grant.
		
		  	 If the Company is subject to a Change in Control before your Service with the Company terminates, then this option will become exercisable with
respect to 50% of the then unvested option Shares.
  
 In the event this option is assumed
by the surviving corporation or its parent in connection with a Change in Control and if you are subject to an Involuntary Termination within 12 months after the Change in Control, then this option will become exercisable in full with respect to all
of the option Shares.

		
		  	This option will in no event become exercisable for additional shares after your Service has terminated for any reason.
		
	Term	  	This option expires in any event at the close of business at Company headquarters on the day before the 10th anniversary of the Date of Grant, as shown in the Notice of Stock Option Grant. (It will expire earlier if your Service terminates, as described
below.)
		
	Regular Termination	  	If your Service terminates for any reason except death or total and permanent disability, then this option will expire at the close of business at Company headquarters on the date ninety (90)
days after your termination date. The Company determines when your Service terminates for this purpose.
		
	Death	  	If you die before your Service terminates, then this option will expire at the close of business at Company headquarters on the date that is the first anniversary of the date of
death.
		
	Disability	  	 If your Service terminates because of your total and permanent disability, then this option will expire at the close of business at Company
headquarters on the date that is one hundred and eighty (180) days after your termination date.
  
 For all purposes under this Agreement, “total and permanent disability” means that you are unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be
expected to result in death or which has lasted, or can be expected to last, for a continuous period of not less than one year.

  

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	Leaves of Absence and Part-Time Work	  	 For purposes of this option, your Service does not terminate when you go on a military leave, a sick leave or another bona fide leave of
absence, if the leave was approved by the Company in writing and if continued crediting of Service is required by the terms of the leave or by applicable law. However, your Service terminates when the approved leave ends, unless you immediately
return to active work for the Company.
  
 If you go on a leave of absence, then the
vesting schedule specified in the Notice of Stock Option Grant may be adjusted in accordance with the Company’s leave of absence policy or the terms of your leave. If you commence working on a part-time basis, then the vesting schedule
specified in the Notice of Stock Option Grant may be adjusted in accordance with the Company’s part-time work policy or the terms of an agreement between you and the Company pertaining to your part-time schedule.

		
	Restrictions on Exercise	  	The Company will not permit you to exercise this option if the issuance of shares at that time would violate any law or regulation.
		
	Notice of Exercise	  	 When you wish to exercise this option, you must notify the Company by filing the proper “Notice of Exercise” form at the address given
on the form. Your notice must specify how many shares you wish to purchase. Your notice must also specify how your shares should be registered. The notice will be effective when the Company receives it.
  
 If someone else wants to exercise this option after your death, that person must prove to the
Company’s satisfaction that he or she is entitled to do so.

		
	Form of Payment	  	 When you submit your notice of exercise, you must include payment of the option exercise price for the shares that you are purchasing. To the
extent permitted by applicable law, payment may be made in one (or a combination of two or more) of the following forms:
  
 •      Your personal check, a cashier’s check or a money order.
  
 •      Certificates for
shares of Company stock that you own, along with any forms needed to effect a transfer of those shares to the Company. The value of the shares, determined as of the effective date of the option exercise, will be applied to the option exercise price.
Instead of surrendering shares of Company stock, you may attest to the ownership of those shares on a form provided by the Company and have the same number of shares subtracted from the option shares issued to you.
  
 •      Irrevocable
directions to a securities broker approved by the Company to sell all or part of your option shares and to deliver to the Company from the sale proceeds an amount sufficient to pay the option exercise price and any withholding taxes. (The balance of
the sale proceeds, if any, will be delivered to you.) The directions must be given by signing a special “Notice of Exercise” form provided by the Company.

  

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	Withholding Taxes and Stock Withholding	  	You will not be allowed to exercise this option unless you make arrangements acceptable to the Company to pay any withholding taxes that may be due as a result of the option exercise. With
the Company’s consent, these arrangements may include withholding shares of Company stock that otherwise would be issued to you when you exercise this option. The value of these shares, determined as of the effective date of the option
exercise, will be applied to the withholding taxes.
		
	Restrictions on Resale	  	You agree not to sell any option shares at a time when applicable laws, Company policies or an agreement between the Company and its underwriters prohibit a sale. This restriction will apply
as long as your Service continues and for such period of time after the termination of your Service as the Company may specify.
		
	Transfer of Option	  	Prior to your death, only you may exercise this option. You cannot transfer or assign this option. For instance, you may not sell this option or use it as security for a loan. If you attempt
to do any of these things, this option will immediately become invalid. You may, however, dispose of this option in your will or a beneficiary designation.
		
		  	Regardless of any marital property settlement agreement, the Company is not obligated to honor a notice of exercise from your former spouse, nor is the Company obligated to recognize your
former spouse’s interest in your option in any other way.
		
	Retention Rights	  	Your option or this Agreement does not give you the right to be retained by the Company or any subsidiary of the Company in any capacity. The Company and its subsidiaries, if any, reserve the
right to terminate your Service at any time, with or without cause.
		
	Stockholder Rights	  	You, or your estate or heirs, have no rights as a stockholder of the Company until you have exercised this option by giving the required notice to the Company and paying the exercise price.
No adjustments are made for dividends or other rights if the applicable record date occurs before you exercise this option, except as described in the Plan.

  

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	Adjustments	  	In the event of a stock split, a stock dividend or a similar change in Company stock, the number of shares covered by this option and the exercise price per share may be adjusted pursuant to
the Plan.
		
	Applicable Law	  	This Agreement will be interpreted and enforced under the laws of the State of Delaware (without regard to its choice-of-law provisions that would require the application of the law of any
other jurisdiction).
		
	The Plan and Other Agreements	  	 The text of the Plan is incorporated in this Agreement by reference. Capitalized terms not otherwise defined in this Agreement shall be defined as
set forth in the Plan.
  
 This Agreement and the Plan constitute the entire understanding
between you and the Company regarding this option. Any prior agreements, commitments or negotiations concerning this option are superseded. This Agreement may be amended only by another written agreement between the parties.

 BY SIGNING THE COVER
SHEET OF THIS AGREEMENT, YOU AGREE TO ALL OF THE 
 TERMS AND CONDITIONS DESCRIBED ABOVE AND IN
THE PLAN. 
  

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