Harold S. Hemstreet v. Computer Entry Systems Corporation

PLAGER, Circuit Judge.

Appellant Harold S. Hemstreet (Hem-street) appeals the order of the District Court for the Northern District of Illinois entering summary judgment in favor of defendant Computer Entry Systems Corp. (CES). Hemstreet v. Computer Entry Systems Corp., 741 F.Supp. 1308, 16 USPQ2d 1204 (N.D.Ill.1990). The trial court held that Hemstreet was barred by the doctrine of laches from asserting claims for patent infringement which arose prior to the filing of suit on August 3,1989. The trial court further held that Hemstreet was barred by the doctrine of equitable estoppel from…