octrine of Equivalents

The Doctrine of Equivalents is a critical legal principle in patent law, developed to prevent an accused infringer from escaping liability by making trivial changes to a patented invention. This doctrine ensures that a patent holder retains the full scope of their invention’s protection, even when an infringer's product or process does not literally infringe on the patent claims. The doctrine thus balances fairness and prevents the manipulation of patent language to evade legal consequences.

Historical Context and Legal Basis

The Doctrine of Equivalents originated in the United States with the case of Winans v. Denmead (1853). The U.S. Supreme Court ruled that minor, insubstantial changes that achieve the same outcome as a patented invention could still be deemed infringing. Over time, this principle has been refined through numerous cases, notably Graver Tank & Manufacturing Co. v. Linde Air Products Co. (1950). In this case, the Supreme Court articulated the test for equivalency, emphasizing that a device or process is equivalent if it performs "substantially the ___ __________ _________ _________ _________ _________ _____ _______ ________ __________ ________.
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