Mealey's (November 30, 2018, 7:31 AM EST) -- WASHINGTON, D.C. — The Federal Circuit U.S. Court of Appeals on Nov. 14 agreed to allow the United States to weigh in on a constitutional challenge to the Leahy Smith America Invents Act, Pub. L. No. 112-29, 125 Stat. 284 (2011), in which an appellant alleges that inter partes review (IPR) should be disallowed for patents issued before the statute’s passage (OSI Pharmaceuticals LLC v. Apotex Inc., et al., No. 18-1925, Fed. Cir.)....