{"data":{"id":"us/37-cfr-42.23","jurisdiction":"us","citation":"37 CFR 42.23","heading":"Oppositions, replies, and sur-replies.","body":"(a) Oppositions, replies, and sur-replies must comply with the content requirements for motions and, if the paper to which the opposition, reply, or sur-reply is responding contains a statement of material fact, must include a listing of facts that are admitted, denied, or cannot be admitted or denied. Any material fact not specifically denied may be considered admitted.\n(b) All arguments for the relief requested in a motion must be made in the motion. A reply may only respond to arguments raised in the corresponding opposition, patent owner preliminary response, patent owner response, or decision on institution. A sur-reply may only respond to arguments raised in the corresponding reply and may not be accompanied by new evidence other than deposition transcripts of the cross-examination of any reply witness.","path":["Title 37—Patents, Trademarks, and Copyrights","CHAPTER I—UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE","SUBCHAPTER A—GENERAL","PART 42—TRIAL PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD","Subpart A—Trial Practice and Procedure"],"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":"37f55e8d02f94fff33e5be8b37d5aece4af32a3e9df1ef205fe28f6ea2ec9b83","source_id":"us-cfr","stale":true,"prev":"us/37-cfr-42.22","next":"us/37-cfr-42.24"},"notice":"GroundRules: Original legal text. Not legal advice."}