Bayer CropScience AG v. Dow AgroSciences, LLC

Bayer’s patent concerns genetically modifying plants to confer resistance to a common herbicide (2,4-D) by inserting a particular DNA segment into plant cells, which reproduce to create new cells that contain that gene. Those cells produce an enzyme that catalyzes a biochemical reaction with 2,4-D in which the herbicide is broken down into something harmless to the plant. A plant with the gene survives 2,4-D application while surrounding weeds do not. At the time of the patent application, the inventors had sequenced one gene coding for one enzyme, using a test supposedly capable of finding other, similar genes. In writing the application, they claimed a broad category based on the function of the particular enzyme, defining the category by using a term with established scientific meaning. Years before the patent issued, experiments showed that the term did not apply to the particular enzyme whose gene was sequenced, but Bayer did not change its claim language. When Bayer sued Dow for infringement, Bayer recognized that the term’s established scientific meaning, did not cover the accused product, which was, itself, different from the enzyme whose gene Bayer’s inventors had sequenced. Bayer argued for broad functional claim construction. The district court entered summary judgment of noninfringement, citing particularly the great breadth of the asserted functional construction. The Federal Circuit affirmed. View "Bayer CropScience AG v. Dow AgroSciences, LLC" on Justia Law