A doctrine that says a patent may not be granted if the invention was used by the public for more than a certain period of time prior to the filing of the patent application is known as:

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The doctrine is known as the public use doctrine and it states that a patent may not be granted if the invention was used by the public for more than a certain period of time prior to the filing of the patent application. This is to ensure that inventors do not monopolize inventions that have already been in public use for a significant amount of time.

A Doctrine That Says a Patent May Not Be Granted