In Exxon Chemical Patents, Inc. v. Lubrizol Corp. and its companion decision, the US Court of Appeals for the Federal Circuit held that a chemical composition claimed in an ingredient-based form is not infringed when there is interaction between the ingredients after they have been combined so as to later either their quantity or their chemical form. This article discusses the impact of the decisions on chemical drafting of chemical inventions. The author argues that the decisions were wrongly decided. Furthermore, the author proposes an amendment to the Patent Act to allow ingredient-based claiming to continue to be used and overrule Lubrizol decision. Meanwhile, the author suggests an interim measure to minimize chemical invention patentees' risks in light of the Lubrizol decision.
Caroline Frances Barry, Chemical Claims Drafting After Lubrizol, 20 J. Marshall J. Computer & Info. L. 207 (2002)