# 37 C.F.R. § 42.9 (2026): Action by patent owner

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_9

## Section

- **Citation:** 37 C.F.R. § 42.9 (2026)
- **Heading:** Action by patent owner
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 37 CFR: Patents, Trademarks, and Copyrights / Chapter I: UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE / Part 42: TRIAL PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD / Subpart A: Trial Practice and Procedure / § 42.9: § 42.9   Action by patent owner.

## Text

(a)
Entire interest.
An owner of the entire interest in an involved application or patent may act to the exclusion of the inventor (
see
§ 3.71 of this title).
(b)
Part interest.
An owner of a part interest in the subject patent may move to act to the exclusion of an inventor or a co-owner. The motion must show the inability or refusal of an inventor or co-owner to prosecute the proceeding or other cause why it is in the interests of justice to permit the owner of a part interest to act in the trial. In granting the motion, the Board may set conditions on the actions of the parties.

## Nearby sections

- [37 C.F.R. § 42.1 (2026) § 42.1   Policy.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_1.md)
- [37 C.F.R. § 42.2 (2026) § 42.2   Definitions.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_2.md)
- [37 C.F.R. § 42.3 (2026) § 42.3   Jurisdiction.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_3.md)
- [37 C.F.R. § 42.4 (2026) § 42.4   Notice of trial.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_4.md)
- [37 C.F.R. § 42.5 (2026) § 42.5   Conduct of the proceeding.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_5.md)
- [37 C.F.R. § 42.6 (2026) § 42.6   Filing of documents, including exhibits; service.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_6.md)
- [37 C.F.R. § 42.7 (2026) § 42.7   Management of the record.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_7.md)
- [37 C.F.R. § 42.8 (2026) § 42.8   Mandatory notices.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_8.md)
- [37 C.F.R. § 42.9 (2026) § 42.9   Action by patent owner.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_9.md)
- [37 C.F.R. § 42.10 (2026) § 42.10   Counsel.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_10.md)
- [37 C.F.R. § 42.11 (2026) § 42.11   Duty of candor; signing papers; representations to the Board; sanctions.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_11.md)
- [37 C.F.R. § 42.12 (2026) § 42.12   Sanctions.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_12.md)
- [37 C.F.R. § 42.13 (2026) § 42.13   Citation of authority.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_13.md)
- [37 C.F.R. § 42.14 (2026) § 42.14   Public availability.](https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_14.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T37_P42_S42_9. Check the current official text before relying on it. Not legal advice.