by Dennis Crouch
The Supreme Court's landmark 1950 decision in Graver Tank & Mfg. Co. v. Linde Air Products Co., 339 U.S. 605 (1950) is one of the court's most cited patent cases. The decision established important guideposts for applying the doctrine of equivalents ("DOE"), including consideration of the prior art and a focus on the substantiality of differences. While courts today emphasize evaluating equivalence on an element-by-element basis, Graver Tank's substantive analysis remains highly influential.
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