definiens: shall mean the patents and patent applications listed on Exhibit A and any other United States or foreign patent applications(s ) and patents(s ) licensed to Licensor by Yale pursuant to the Yale License Agreement during the term of this Agreement pertaining specifically to the compound, P - L - FD4C, together with any foreign counterparts, continuations, continuations - in - part, divisional or substitute patents, any reissues or reexaminations of any such applications or patents, and any extension of any such patents including the patents and patent applications listed on Exhibit B ~ and all patents and patent applications filed on or on behalf of Yale or Licensor or issued during the term hereof to Yale or Licensor for any improvements on, or derivations from, the Inventions that pertain specifically to the compound P - L - FD4C and are useful for the development, commercialization, manufacture, use or sale of any Licensed Products