Mealey's (December 2, 2020, 12:43 PM EST) -- WASHINGTON, D.C. — Efforts by patent infringement defendants to stay Texas federal litigation while the U.S. Patent and Trademark Office’s Patent Trial and Appeal Board decides whether to institute their petition for post-grant review (PGR) were unsuccessful Nov. 25, when the Federal Circuit U.S. Court of Appeals denied mandamus (In re: Vulcan Industrial Holdings LLC, No. 20-151, Fed. Cir., 2020 U.S. App. LEXIS 37214)....