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Entrapment by estoppel: In American criminal law, although "ignorance of the law is no excuse" is a principle which generally holds for traditional (older common law) crimes, courts sometimes allow this excuse as a defense, when defendant can show they reasonably relied on an interpretation of the law by the public official(s) charged with ...
But this estoppel, for manifest reasons, does not prevent him from denying infringement. To determine such an issue, it is admissible to show the state of the art involved, that the court may see what the thing was which was assigned, and thus determine the primary or secondary character of the patent assigned, and the extent to which the ...
The courts have used direct estoppel to prevent a party from bringing the same cause of action several times. For example, in Peare v. Griggss, the appellate court reversed a judgment awarded to a widow-plaintiff because the direct estoppel doctrine prevented the plaintiff from receiving damages arising out of the same controversy.
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 ...
Collateral estoppel (CE), known in modern terminology as issue preclusion, is a common law estoppel doctrine that prevents a person from relitigating an issue. One summary is that, "once a court has decided an issue of fact or law necessary to its judgment, that decision ... preclude[s] relitigation of the issue in a suit on a different cause of action involving a party to the first case". [1]
The doctrine of assignor estoppel is a doctrine of United States patent law barring a patent's seller (assignor) from attacking the patent's validity in subsequent patent infringement litigation. The doctrine is based on the doctrine of legal estoppel , which prohibits a grantor (typically, of real property) from challenging the validity of his ...
Central London Property Trust Ltd v High Trees House Ltd [1947] KB 130, commonly called High Trees, is a leading opinion in the High Court relating to contract law.It reaffirmed and extended the doctrine of promissory estoppel in the contract law of England and Wales.