Tribunal means the Office, a court, an arbitrator in a binding arbitration proceeding or a legislative body, administrative agency or other body acting in an adjudicative capacity. A legislative body, administrative agency or other body acts in an adjudicative capacity when a neutral official, after the presentation of evidence or legal argument by a party or parties, will render a binding legal judgment directly affecting a party's interests in a particular matter.
37 CFR § 11.1
This part governs solely the practice of patent, trademark, and other law before the United States Patent and Trademark Office. Nothing in this part shall be construed to preempt the authority of each State to regulate the practice of law, except to the extent necessary for the United States Patent and Trademark Office to accomplish its Federal objectives. Unless otherwise clear from the context, the following definitions apply to this part: