Northern District Of Illinois Uses Collateral Estoppel To Find Patents Invalid Based On PTAB’s Unpatentability Rulings On Similar Patents
On October 8, 2020, Judge Andrea R. Wood of the United States District Court for the Northern District of Illinois denied plaintiff Think Product, Inc.’s motion to reconsider a finding of patent invalidity. Think Products, Inc. v. Acco Brands Corp. and Acco Brands, USA LLC, No. 18-cv-07506 (N.D. Ill. Oct. 8, 2020). The Court had previously granted defendants Acco Brands Corporation’s and Acco Brands, USA LLC’s motion for summary judgment invalidating two patents based on collateral estoppel arising from rulings by the Patent Trial and Appeal Board (“PTAB”) invalidating for obviousness two similar patents.