exhibit 10. 20 exclusive license agreement for : mechanism to enable normal gait despite leg injuries, decreasing oxygen consumption by use of a load - carrying exoskeleton, under - actuated transfemoral prosthetic knee, and controlling the swinging leg of an exoskeleton uc case numbers : b07 - 128, b08 - 119, b08 - 125, b08 - 141 this license agreement ( “ agreement ” ) is entered into as of the date that this agreement is fully executed by both parties ( “ effective date ” ), by and between the regents of the university of california, a california corporation, having its statewide administrative offices at 1111 franklin street, 12th floor, oakland, california # # # - # # # - # # # # acting through its office of technology licensing, at the university of california, berkeley, having its administrative office at 2150 shattuck avenue, suite 510, berkeley, ca # # # - # # # - # # # # ( “ regents ” ), and berkeley exotech, inc. dba berkeley bionics and formerly dba berkeley exoworks ( “ licensee ” ), a delaware corporation, having a principal place of business at 2131 university avenue, # 428, berkeley, ca 94704. the parties agree as follows : 1. background 1. 1 regents has an assignment of the intellectual property characterized as ( collectively “ inventions ” ) : 1. 1a mechanism to support those with lower leg injuries while enabling them to walk with a near normal gait as described in regents case number b07 - 128 and patent rights that was invented by homayoon kazerooni, sara marie haislip, jonathan ames, and esha datta, all employed by the university of california, berkeley at the time that the invention was made ; 1. 1b device and method for decreasing oxygen consumption of a person during steady walking by use of a load - carrying exoskeleton as described in regents case number b08 - 119 and patent rights that was invented by homayoon kazerooni and kurt amundson, all employed by the university of california, berkeley at the time that the invention was made, and also invented by russ angold and nathan harding, all employed by licensee at the time that the invention was made ; accordingly, the patent rights for this invention are expected to be jointly - owned between