definiens: shall mean any patentable invention ( i ) for which ( a ) at least one inventor is an employee or a researcher of University and/or JSR and ( b ) at least one inventor is an employee of the Company or ( ii ) obtained from the use of the Materials delivered or trans ferred by the University or JSR to the Company, provided that such Materials are not available from other sources at the time of such use . The Parties should take reasonable methods and/or actions to prevent any person, other than a Personnel of a Party ( ) from being as an inventor of Joint Invention . For the avoidance of doubt, JSR and University understand that Professors Rotem Sorek and Eran Elinav of the Weizmann Institute of Science who are founders of the Company ( the ) con sult the Company and may be inventors on Joint Inventions . In such case, the inventorship interests of the WIS Founders would be owned by Yeda and licensed to the Company in accordance with the Company ’s agreement with Yeda . In case any Third Person, inclu ding the WIS Founders, is an inventor of the Joint Invention either because of the consulting of the WIS Founders or under some unavoidable situation, the Party who initiated the communication with a third party to which a Third Person belongs ( ) should cause such third party to accept all obligations with respect to the Joint Invention and/or Joint Patent Rights the Responsible Party owes hereunder as if such third party is the Responsible Party or in case of WIS Founders to have Yeda si gn a letter agreement in a form substantially similar to the one attached hereto as Appendix B ( if a Third Person does not belong to any entity, this sentence shall be read to replace with ) . In addition if other Parties th an the Responsible Party request the document to demonstrate such third party ’s acceptance of the obligations hereunder, the Responsible Party shall submit such document satisfactory to other Parties without delay . of a Party means an employee, other researcher, consultant or contractor of a Party who is required to assign all of his / her / its rights in the Joint Invention to such Party