Mealey's (October 16, 2019, 12:45 PM EDT) -- WASHINGTON, D.C. — A combination of prior art references relied upon by the Patent Trial and Appeal Board does not present substantial evidence of obviousness, the Federal Circuit U.S. Court of Appeals ruled Oct. 15 (Knauf Insulation Inc. v. Rockwool International A/S, Nos. 2018-1810, 2018-1811, 2018-1891, Fed. Cir., 2019 U.S. App. LEXIS 30634)....