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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 37
Chapter I
Part 41 - PART 41—PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD
Subpart A [§ 41.1 - § 41.20] - Subpart A—General Provisions
Subpart B [§ 41.30 - § 41.54] - Subpart B—Ex Parte Appeals
Subpart C [§ 41.60 - § 41.81] - Subpart C—Inter Partes Appeals
Subpart D [§ 41.100 - § 41.158] - Subpart D—Contested Cases
Subpart E [§ 41.200 - § 41.208] - Subpart E—Patent Interferences
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