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Warner-Jenkinson Co. v. Hilton Davis Chemical Co.
''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.
==Facts==
The plaintiff Hilton Davis Chemical Co., a dyemaker, had developed an "ultrafiltration" process to purify dyes. An amendment to the patent had specified that a solution used in the process must have a pH level between 6.0 and 9.0. The amendment was filed in order to clarify that this patent did not overlap with a previously patented process that used a solution with a pH level above 9.0 - however, the plaintiff was unable to explain why the amendment stated a ''lower'' level of 6.0. The defendant had developed a process using a solution with a pH level of 5.0, which was outside the range of the plaintiff's patent.
The plaintiff sued for infringement, conceding that the defendant's process did not ''literally'' infringe, but relying on the doctrine of equivalents to support the claim of infringement. The defendant argued that the doctrine of equivalents was no longer appropriate for courts to use because Congress had made some changes to the patent statute after the Supreme Court's 1950 decision establishing the propriety of using the doctrine.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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