Number: RL31156 Title: Patent Law: The Festo Case and the Doctrine of Equivalents Authors: Margaret Mikyung Lee, American Law Division Abstract: This report summarizes the legal background of the Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Company case, the opinions in the en banc decision of the U.S. Court of Appeals for the Federal Circuit in the case, the petitioner's arguments in the brief submitted to the U.S. Supreme Court, and the ramifications of the CAFC decision. Pages: 16 Date: Updated July 25, 2002