---
kind: "unit"
title: "37"
title_heading: "Patents, Trademarks, and Copyrights"
key: "chI/subchA/part1/subpartD"
level: "subpart"
label: "Subpart D"
heading: "Ex Parte Reexamination of Patents"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/37/chI-subchA-part1-subpartD"
sections_count: 15
---

# Subpart D — Ex Parte Reexamination of Patents

Title 37 C.F.R. — Patents, Trademarks, and Copyrights › Chapter I — United States Patent and Trademark Office, Department of Commerce › Subchapter A — General › Part 1 — Rules of Practice in Patent Cases

## Sections

- [§1.501. Citation of prior art and written statements in patent files.](/cfr/37/1.501.md)
- [§1.502. Processing of prior art citations during an ex parte reexamination proceeding.](/cfr/37/1.502.md)
- [§1.510. Request for ex parte reexamination.](/cfr/37/1.510.md)
- [§1.515. Determination of the request for ex parte reexamination.](/cfr/37/1.515.md)
- [§1.520. Ex parte reexamination at the initiative of the Director.](/cfr/37/1.520.md)
- [§1.525. Order for ex parte reexamination.](/cfr/37/1.525.md)
- [§1.530. Statement by patent owner in ex parte reexamination; amendment by patent owner in ex parte or inter partes reexamination; inventorship change in ex parte or inter partes reexamination.](/cfr/37/1.530.md)
- [§1.535. Reply by third party requester in ex parte reexamination.](/cfr/37/1.535.md)
- [§1.540. Consideration of responses in ex parte reexamination.](/cfr/37/1.540.md)
- [§1.550. Conduct of ex parte reexamination proceedings.](/cfr/37/1.550.md)
- [§1.552. Scope of reexamination in ex parte reexamination proceedings.](/cfr/37/1.552.md)
- [§1.555. Information material to patentability in ex parte reexamination and inter partes reexamination proceedings.](/cfr/37/1.555.md)
- [§1.560. Interviews in ex parte reexamination proceedings.](/cfr/37/1.560.md)
- [§1.565. Concurrent office proceedings which include an ex parte reexamination proceeding.](/cfr/37/1.565.md)
- [§1.570. Issuance and publication of ex parte reexamination certificate concludes ex parte reexamination proceeding.](/cfr/37/1.570.md)