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Prosecution history estoppel, also known as file-wrapper estoppel, is a term used to indicate that a person who has filed a patent application, and then makes narrowing amendments to the application to accommodate the patent law, may be precluded from invoking the doctrine of equivalents to broaden the scope of their claims to cover subject matter ceded by the amendments.
Proprietary estoppel is not a concept in American law, but a similar result is often reached under the general doctrine of promissory estoppel. Traditionally, proprietary estoppel arose in relation to rights to use the land of the owner, and possibly in connection with disputed transfers of ownership.
Estoppel forms part of the rules of equity, which were originally administered in the Chancery courts. Estoppel in English law is a doctrine that may be used in certain situations to prevent a person from relying upon certain rights, or upon a set of facts (e.g. words said or actions performed) which is different from an earlier set of facts.
Legal jurisdictions which provide for apparent authority include the United States, the United Kingdom, Australia, Canada and South Africa.The doctrine of apparent authority is based on the concept of estoppel, thus, it prevents the principal from denying the existence of agency to a third party, provided that a representation, as to the agent's authority, has been made by him to the third ...
One type of estoppel recognised in Canada's common law jurisdictions is estoppel by convention, which operates where three criteria are satisfied: 1) a "manifest representation" of a "shared assumption of fact or law" pertaining to the application or construction of a contractual term, 2) one party acts in reliance of the "shared assumption" in ...
Whether provincial The Saskatchewan Farm Security Act is constitutionally inoperative when an application is made to appoint a national receiver under the federal Bankruptcy and Insolvency Act, by reason of the doctrine of federal paramountcy: Gascon J: Cromwell, Moldaver, Karakatsanis and Wagner JJ: R v Hecimovic 2015 SCC 54
The original owner can obtain protection against the former owner through the doctrine of estoppel (see also, s 21(1) of the Sale of Goods Act 1979 "unless the owner of the goods is by his conduct precluded from denying the seller's authority to sell"). Methods of the estoppel can be by words, by conduct, or by negligence.
Festo Corp. v Shoketsu Kinzoku Kogyo Kabushiki Co., 535 U.S. 722 (2002), was a United States Supreme Court decision in the area of patent law that examined the relationship between the doctrine of equivalents (which holds that a patent can be infringed by something that is not literally falling within the scope of the claims because a somewhat insubstantial feature or element has been ...