Legal estoppel

Legal estoppel is a principle of law, particularly United States patent law, that an assignor or grantor is not permitted subsequently to deny the validity of title to the subject matter of the assignment or grant. Originally a principle of real property law, applicable to deeds of land and called estoppel by deed, the Supreme Court extended legal estoppel to patents in Westinghouse Elec. & Mfg. Co. v. Formica Insulation Co.

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