Legal Opinion
Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co.
Supreme Court of the United States
Decided May 28, 2002No. 00-1543PublishedCited by 654 opinions
1Opinion of the CourtJustice Kennedy
This case requires us to address once again the relation between two patent law concepts, the doctrine of equivalents and the rule of prosecution history estoppel. The Court considered the same concepts in Warner-Jenkinson Co. v. Hilton Davis Chemical Co., 520 U. S. 17 (1997), and reaf firmed that a patent protects its holder against efforts of copyists to evade liability for infringement by making only insubstantial changes to a patented invention. At the same time, we appreciated that by extending protection beyond the literal terms in a patent the doctrine of equivalents can create…
2Cases cited15 opinions
- Graver Tank & Mfg. Co. v. Linde Air Products Co.Supreme Court of the United States · 1950
- Warner-Jenkinson Co. v. Hilton Davis Chemical Co.Supreme Court of the United States · 1997
- Bonito Boats, Inc. v. Thunder Craft Boats, Inc.Supreme Court of the United States · 1989
- Autogiro Company of America v. The United StatesUnited States Court of Claims · 1967
- Winans v. DenmeadSupreme Court of the United States · 1854
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3Cited by654 opinions
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- Ariad Pharmaceuticals, Inc. v. Eli Lilly and Co.Court of Appeals for the Federal Circuit · 2010
- Allen Engineering Corporation v. Bartell Industries, Inc. And Darragh CompanyCourt of Appeals for the Federal Circuit · 2002
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