Owens Corning v. Fast Felt Corp (Fed. Cir. 2017)
After being sued for infringing Fast Felt's U.S. Patent No. 8,137,757, Owens Corning retaliated with a petition for inter partes review. Although the PTO instituted the IPR, the PTAB eventually determined that the claims were not obvious -- i.e., that "Owens Corning had failed to show obviousness of any of the challenged claims." On appeal, the Federal Circuit has reversed -- holding that under a proper BRI claim construction, that the claims are obvious.