Prosecution history estoppel, also known as file-wrapper estoppel, is a term used in United States patent law to indicate that a person who has filed a patent application, and then makes amendments to the application to accommodate the patent law, has no cause of action for infringement to the pre-amendment patent claims that were amended.

Although primarily a US term, questions of whether, or the extent to which the prosecution history should be relevant for determining the extent of protection of a patent also arise outside the US



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