E.I. DuPont de Nemours & Co. v. Unifrax I LLC, No. 17-2575 (Fed. Cir. 2019)Annotate this Case
DuPont’s 926 patent, entitled “Composite Flame Barrier Laminate for a Thermal and Acoustic Insulation Blanket,” issued in December 2013 and claims composite laminates that are incorporated into thermal-acoustic blankets installed on the interior of the fuselage in aircraft to shield passengers from flames and reduce noise. The Federal Circuit affirmed the district court’s construction of the term “100% by weight” to mean “[t]here is no carrier material such as resin, adhesive, cloth, or paper in addition to the inorganic platelets. The court also upheld findings that the patent was not invalid and that Unifrax’s flame barrier product infringed the patent. Substantial evidence supported a finding that the patent was not anticipated by prior art.