Abbreviation for the United States Patent and Trademark Office. It was known as the United States Patent Office until 1975. The PTO is located in Arlington, Virginia, it is about a fifteen minute Metro ride from the Reagan National Airport.

Decisions made by the examiners of the PTO must first be appealed within the PTO itself. See Board of Appeals. After the administrative appeal has been completed, the decision of the Board of Appeal may be appealed to the Court of Appeals for the Federal Circuit. See CAFC.

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