Festo Corp. v Shoketsu Kinzoku Kogyo Kabushiki Co., 535 U.S. 722 (2002)

Case Description

The United States Supreme Court ruled that amending (i.e. narrowing) a patent claim during prosecution does not necessarily result in a complete bar to the doctrine of equivalents. It rejected the Federal Circuit’s decision that a complete bar to equivalents always results when a claim is narrowed during prosecution and thereby confirmed its own case law.

Decision Year
Pre-grant flexibilities