---
kind: "unit"
title: "37"
title_heading: "Patents, Trademarks, and Copyrights"
key: "chI/subchA/part42"
level: "part"
label: "Part 42"
heading: "Trial Practice Before the Patent Trial and Appeal Board"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/37/chI-subchA-part42"
sections_count: 85
---

# Part 42 — Trial Practice Before the Patent Trial and Appeal Board

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 — Trial Practice and Procedure](/cfr/37/chI-subchA-part42-subpartA.md)
- [Subpart B — Inter Partes Review](/cfr/37/chI-subchA-part42-subpartB.md)
- [Subpart C — Post-Grant Review](/cfr/37/chI-subchA-part42-subpartC.md)
- [Subpart D — Transitional Program for Covered Business Method Patents](/cfr/37/chI-subchA-part42-subpartD.md)
- [Subpart E — Derivation](/cfr/37/chI-subchA-part42-subpartE.md)