EB: My Example for Doctrine of Equivalents
Sage Products, Inc. v. Devon Industries, Inc., 126 F. 3d 1420 - Court of Appeals, Federal Circuit 1997
Sage sues Devon for infringement of several patents relating to containers for disposing of hazardous medical waste (needles etc.). Devon counter-sues for infringement of one of its similar patents.
The district court held (on summary judgement) that there was no infringement by either party literally or equivalently. The appellate court affirms.