Common use of Patent Challenge Clause in Contracts

Patent Challenge. Exelixis shall have the right to terminate this Agreement immediately in its entirety upon written notice to Licensee if Licensee or any of its Affiliates or Sublicensees directly, or indirectly through any Third Party, commences any interference or opposition proceeding with respect to, challenges the validity or enforceability of, or opposes any extension of or the grant of a supplementary protection certificate with respect to, any Exelixis Patent.

Patent Challenge. Exelixis shall have the right to terminate this Agreement immediately in its entirety upon written notice to Licensee Collaborator if Licensee Collaborator or any of its Affiliates or Sublicensees directly, or indirectly through any Third Party, commences any interference or opposition proceeding with respect to, challenges the validity or enforceability of, or opposes any extension of or the grant of a supplementary protection certificate with respect to, any Exelixis Patent.