{"data":{"id":"us/37-cfr-11.307","jurisdiction":"us","citation":"37 CFR 11.307","heading":"Practitioner as witness.","body":"(a) A practitioner shall not act as advocate at a proceeding before a tribunal in which the practitioner is likely to be a necessary witness unless:\n(1) The testimony relates to an uncontested issue;\n(2) The testimony relates to the nature and value of legal services rendered in the case; or\n(3) Disqualification of the practitioner would work substantial hardship on the client.\n(b) A practitioner may act as advocate in a proceeding before a tribunal in which another practitioner in the practitioner's firm is likely to be called as a witness unless precluded from doing so by §§ 11.107 or 11.109.","path":["Title 37—Patents, Trademarks, and Copyrights","CHAPTER I—UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE","SUBCHAPTER A—GENERAL","PART 11—REPRESENTATION OF OTHERS BEFORE THE UNITED STATES PATENT AND TRADEMARK OFFICE","Subpart D—USPTO Rules of Professional Conduct"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-37.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:45Z","sha256":"59f70efd8dae245fb4e64064b00b19ffaa784e9bb59c5829f23c4b47ae7a3445","source_id":"us-cfr","stale":true,"prev":"us/37-cfr-11.306","next":"us/37-cfr-11.308"},"notice":"GroundRules: Original legal text. Not legal advice."}