Warner-Jenkinson Co. v. Hilton Davis Chemical Co.

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Warner-Jenkinson Company, Inc. v. Hilton Davis Chemical Co.
Supreme Court of the United States
Argued October 15, 1996 Decided March 3, 1997
Full case name	Warner-Jenkinson Company, Incorporated, et al. v. Hilton Davis Chemical Company
Citations	520 U.S. 17 (more) 117 S. Ct. 1040; 137 L. Ed. 2d 146; 1997 U.S. LEXIS 1476; 65 U.S.L.W. 4162; 41 U.S.P.Q.2d (BNA) 1865; 97 Cal. Daily Op. Service 1540; 97 Daily Journal DAR 2249; 10 Fla. L. Weekly Fed. S 321
Argument	Oral argument
Case history
Prior	Hilton Davis Chem. Co. v. Warner-Jenkinson Co., 62 F.3d 1512 (Fed. Cir. 1995); cert. granted, 516 U.S. 1145 (1996).
Holding
The Doctrine of Equivalents is consistent with the 1952 revisions to the Patent Act and patentees may attempt to prove that an amendment was not made to be limiting. Reversed and remanded.
Court membership
Chief Justice William Rehnquist Associate Justices John P. Stevens · Sandra Day O'Connor Antonin Scalia · Anthony Kennedy David Souter · Clarence Thomas Ruth Bader Ginsburg · Stephen Breyer
Case opinions
Majority	Thomas, joined by unanimous
Concurrence	Ginsburg, joined by Kennedy
Laws applied
Patent Act of 1952

Warner-Jenkinson Company, Inc. v. Hilton Davis Chemical Co., 520 U.S. 17 (1997), was a United States Supreme Court decision in the area of patent law, affirming the continued vitality of the doctrine of equivalents while making some important refinements to the doctrine.^[1]