(July 22, 2021, 12:58 PM EDT) -- WASHINGTON, D.C. — The maker of the “Sleep Number” mattress told the Federal Circuit U.S. Court of Appeals on July 20 that the Patent Trial and Appeal Board did not err when reviewing expert opinion relating to the secondary indicia of nonobviousness offered in California federal litigation during an inter partes review (IPR) of two patents directed to systems and methods for adjusting air pressure....