definiens: means the Patents withi n the Control of PTC, either as of the Effective Date or thereafter during the T erm, which ( i ) relate to Licensed Products, HCV IRES, Viral IRES Inhibitors, or methods of preparing or using Licensed Products, Viral IRES Inhibitors, or methods of treating, diagnosing or preventing any disease or condition u sing Licensed Products or Viral IRES Inhibitors, or relate to methods or mate rials used for discovering, identifying, or assaying for Viral IRES Inhibitors or Licensed Products, ( ii ) contain claims that would be infringed by the Resea rch, Development, Manufacture, use, import or sale of Collaboration C ompounds or Licensed Products in the Field, and ( iii ) claim inventions Invented p rior to the end of the Research Term . The PTC Patents shall include the PT C NV Patents, as well as the Joint Patents to the extent Controlled by PTC . The PTC Patents shall not include the PTC Background Patents . The PTC Patents existin g as of the Effective Date are listed in Schedule 1.53