Mealey's (August 2, 2018, 3:01 PM EDT) -- WASHINGTON, D.C. — In a July 18 corrected brief, an appellant tells the Federal Circuit U.S. Court of Appeals that the Patent Trial and Appeal Board erred in confirming the validity of a patent used in the oil and gas drilling industry (Packers Plus Energy Services Inc. v. Baker Hughes Oilfield Operations LLC, No. 18-1490, Fed. Cir.)....