Mealey's (April 19, 2021, 1:51 PM EDT) -- WASHINGTON, D.C. — The Federal Circuit U.S. Court of Appeals in an April 16 ruling said that because a petitioner for inter partes review (IPR) failed to establish that a person of skill in the art could make a turbine engine with the power density recited in a challenged gas turbine engine patent, the Patent Trial and Appeal Board erred in declaring the patent obvious....