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EX-23.1 - CONSENT OF RBSM LLP INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM - ENDRA Life Sciences Inc.end_ex231.htm
EX-3.1 - THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF THE REGISTRANT AS CURRENTLY IN EFFECT - ENDRA Life Sciences Inc.end_ex31.htm
EX-10.19 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1019.htm
EX-10.18 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1018.htm
EX-10.17 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1017.htm
EX-10.16 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1016.htm
EX-10.15 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1015.htm
EX-10.14 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1014.htm
EX-10.13 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1013.htm
EX-10.12 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1012.htm
EX-10.11 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1011.htm
EX-10.10 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex1010.htm
EX-10.9 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex109.htm
EX-10.8 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex108.htm
EX-10.7 - MATERIAL CONTRACTS - ENDRA Life Sciences Inc.end_ex107.htm
EX-10.3 - FORM OF INCENTIVE STOCK OPTION AGREEMENT UNDER SECOND AMENDED AND RESTATED 2013 STOCK INCENTIVE PLAN - ENDRA Life Sciences Inc.end_ex103.htm
EX-10.2 - FORM OF NON QUALIFIED STOCK OPTION AWARD UNDER SECOND AMENDED AND RESTATED 2013 STOCK INCENTIVE PLAN - ENDRA Life Sciences Inc.end_ex102.htm
EX-10.1 - ENDRA INC. SECOND AMENDED AND RESTATED 2013 STOCK INCENTIVE PLAN - ENDRA Life Sciences Inc.end_ex101.htm
EX-4.9 - INSTRUMENTS DEFINING THE RIGHTS OF SECURITY HOLDERS, INCLUDING INDENTURES INSTRUMENTS DEFINING THE RIGHTS OF SECURITY HOLDERS, INCLUDING INDENTURES - ENDRA Life Sciences Inc.end_ex49.htm
EX-4.8 - FORM OF PROMISSORY NOTE ISSUED BY THE REGISTRANT TO CERTAIN MEMBERS OF THE BOARD OF DIRECTORS - ENDRA Life Sciences Inc.end_ex48.htm
EX-4.7 - FORM OF CONVERTIBLE PROMISSORY NOTE - ENDRA Life Sciences Inc.end_ex47.htm
EX-4.6 - FORM OF SENIOR PROMISSORY NOTE ISSUED PURSUANT TO SECURITIES PURCHASE AGREEMENT DATED JULY 10 2013 - ENDRA Life Sciences Inc.end_ex46.htm
EX-4.5 - FORM OF WARRANT TO PURCHASE COMMON STOCK ISSUED PURSUANT TO 2015 WARRANT EXERCISE PROGRAM - ENDRA Life Sciences Inc.end_ex45.htm
EX-4.4 - FORM OF WARRANT TO PURCHASE COMMON STOCK ISSUED PURSUANT TO 2013 2014 BRIDGE FINANCING - ENDRA Life Sciences Inc.end_ex44.htm
EX-4.1 - SPECIMEN CERTIFICATE REPRESENTING SHARES OF COMMON STOCK OF THE REGISTRANT - ENDRA Life Sciences Inc.end_ex41.htm
EX-3.5 - ARTICLES OF INCORPORATION BYLAWS - ENDRA Life Sciences Inc.end_ex35.htm
EX-3.2 - BYLAWS OF THE REGISTRANT AS CURRENTLY IN EFFECT - ENDRA Life Sciences Inc.end_ex32.htm
S-1 - REGISTRATION STATEMENT - ENDRA Life Sciences Inc.end_drs.htm
 
Exhibit 10.20
AMENDMENT TO SUBLICENSE AGREEMENT
This Amendment (“Amendment”) to the Sublicense Agreement dated as of August 2, 2007 (the “Agreement”) by and among Endra, Inc., a Delaware corporation (“Endra”), and Optosonics, Inc. (“Optosonics”) is entered into on this 18th day of January, 2011 (the “Amendment Effective Date”). For purposes hereof, all capitalized terms used herein but not defined herein shall have the meanings given to them in the Agreement.
Pursuant to Section 15.4 of the Agreement, Endra and Optosonics hereby agree as follows:
1. Section 3 .6.3(iii) of the Agreement is hereby deleted and replaced in its entirety as follows:
“(iii)                       The diligence requirement will likewise be satisfied if Endra makes a commercial sale of any Product to any third party no later than forty-five (45) months from the Effective Date (the “Commercialization Date”); provided however that Endra may, in its sole discretion, extend the Commercialization Date on a month-by-month basis for up to 9 months beyond the forty-five (45) month anniversary of the Effective Date by paying to Optosonics $5,000 for each month that the Commercialization Date is so extended.”
2. The Agreement is hereby confirmed and continues in all respects expect as set forth in Section 1 above. This Amendment shall not constitute or imply a waiver of any rights or obligations under the Agreement or an admission as to any facts related to the Agreement.
3. Any determination that any provision of this Amendment or any application thereof is invalid, illegal, or unenforceable in any respect in any instance shall not affect the validity, legality, or enforceability of such provision in any other instance, or the validity, legality, or enforceability of any other provision of this Amendment.
4. No modification, amendment or waiver of any provision of this Amendment shall be effective unless executed in writing by Endra and Optosonics.
5. All rights and obligations hereunder, including matters of construction, validity, and performance, shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts and are intended to take effect as sealed instruments.
6. This Amendment may be executed simultaneously in two or more counterparts, each of which shall be deemed an original.
[Remainder of Page Intentionally Blank.]
 
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IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by their duly authorized representatives as of the Amendment Effective Date.
 
ENDRA, INC.
 
 
By:               /s/ Michael Thornton                                                            
Name:          Michael Thornton
Title:            Chief Operating Officer, ENDRA INC.
 
 
OPTOSONICS, INC.
 
 
By:               /s/ Robert Kruger                                                            
Name:          Robert Kruger
Title:            President, OPTOSONICS, INC.
 
 
 
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