Sec. 271. Infringement of patent. 272. Temporary presence in the United States. 273. Defense to infringement based on earlier inventor. AMENDMENTS 1999 - Pub. L. 106-113, div. B, Sec. 1000(a)(9) [title IV, Sec. 4302(b)], Nov. 29, 1999, 113 Stat. 1536, 1501A-557, added item 273.