---
kind: "unit"
title: "37"
title_heading: "Patents, Trademarks, and Copyrights"
key: "chI/subchA/part1"
level: "part"
label: "Part 1"
heading: "Rules of Practice in Patent Cases"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/37/chI-subchA-part1"
sections_count: 363
---

# Part 1 — Rules of Practice in Patent Cases

Title 37 C.F.R. — Patents, Trademarks, and Copyrights › Chapter I — United States Patent and Trademark Office, Department of Commerce › Subchapter A — General

## Contents

- [Subpart A — General Provisions](/cfr/37/chI-subchA-part1-subpartA.md)
- [Subpart B — National Processing Provisions](/cfr/37/chI-subchA-part1-subpartB.md)
- [Subpart C — International Processing Provisions](/cfr/37/chI-subchA-part1-subpartC.md)
- [Subpart D — Ex Parte Reexamination of Patents](/cfr/37/chI-subchA-part1-subpartD.md)
- [Subpart E — Supplemental Examination of Patents](/cfr/37/chI-subchA-part1-subpartE.md)
- [Subpart F — Adjustment and Extension of Patent Term](/cfr/37/chI-subchA-part1-subpartF.md)
- [Subpart G — Biotechnology Invention Disclosures](/cfr/37/chI-subchA-part1-subpartG.md)
- [Subpart H — Inter Partes Reexamination of Patents That Issued From an Original Application Filed in the United States on or After November 29, 1999](/cfr/37/chI-subchA-part1-subpartH.md)
- [Subpart I — International Design Application](/cfr/37/chI-subchA-part1-subpartI.md)