# 37 CFR § 42.9: Action by patent owner

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-37-42.9

## Section

- **Citation:** 37 CFR § 42.9
- **Heading:** Action by patent owner
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 37—Patents, Trademarks, and Copyrights > CHAPTER I—UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE > SUBCHAPTER A—GENERAL > PART 42—TRIAL PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD > Subpart A—Trial Practice and Procedure > General

## 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 CFR § 42.1 § 42.1 Policy.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.1.md)
- [37 CFR § 42.2 § 42.2 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.2.md)
- [37 CFR § 42.3 § 42.3 Jurisdiction.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.3.md)
- [37 CFR § 42.4 § 42.4 Notice of trial.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.4.md)
- [37 CFR § 42.5 § 42.5 Conduct of the proceeding.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.5.md)
- [37 CFR § 42.6 § 42.6 Filing of documents, including exhibits; service.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.6.md)
- [37 CFR § 42.7 § 42.7 Management of the record.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.7.md)
- [37 CFR § 42.8 § 42.8 Mandatory notices.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.8.md)
- [37 CFR § 42.9 § 42.9 Action by patent owner.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.9.md)
- [37 CFR § 42.10 § 42.10 Counsel.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.10.md)
- [37 CFR § 42.11 § 42.11 Duty of candor; signing papers; representations to the Board; sanctions.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.11.md)
- [37 CFR § 42.12 § 42.12 Sanctions.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.12.md)
- [37 CFR § 42.13 § 42.13 Citation of authority.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.13.md)
- [37 CFR § 42.14 § 42.14 Public availability.](https://www.frixlaw.com/law-library/statutes/ecfr-37-42.14.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-37-42.9. Check the current official text before relying on it. Not legal advice.