Plastic Omnium Advanced Innovation and Research v. Donghee America, Inc., No. 18-2087 (Fed. Cir. 2019)Annotate this Case
Omnium sued Donghee, asserting infringement of eight patents, including the 921 and 812 patents, which generally relate to manufacturing plastic fuel tanks formed by blow molding. The fuel tanks are formed in a way that allows accessory components to be installed inside the fuel tank without cutting holes in the tank wall, which could compromise the structural integrity of the wall. The parties disputed the meaning of the term “parison.” Donghee argued that it should be given its plain and ordinary meaning of “hollow plastic tube exiting the die of an extrusion head.” Omnium argued that the patentee had acted as its own lexicographer and that the patents do not use the term in its conventional, ordinary meaning. The district court reasoned that “the patents specify that the ‘parison’ is cut in two as it leaves the die at the end of the extrusion head” and so “this ‘parison’ cannot be strictly limited to a fully-formed tubular structure existing in its entirety outside the extrusion head/die.” It recognized that “the principal disagreements between the parties [were] identifying the point at which the molten plastic within the extrusion head becomes a ‘parison.’ The Federal Circuit affirmed summary judgment of noninfringement, upholding the claim construction as supported by undisputed facts.