republic-os/legal/us/code/title-35/chapter-11/section-121.md

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LegalText	35 U.S.C. § 121	Divisional applications	us	united_states_code	code_section	35	PATENTS	11	APPLICATION FOR PATENT	121	35 U.S.C. § 121	current	119-100	2026-06-26	official	https://uscode.house.gov/download/releasepoints/us/pl/119/100/xml_usc35@119-100.zip	/us/usc/t35/s121	data/legal/raw/us/code/title-35/usc35.xml	18a070374af996ce45821d50742ec496bb250d42c6cc5d9ee2b5956b4cb282f1	736cab508592dcf50013a1aed5ab108f72fd8493e76afc46848cdc35da38bbe3	996b9420e9b1d038e030d0de18ea76f19ae1cf85c78114ab8e1bd5bd9d3cbb51	2026-07-04	official	legal us-code

35 U.S.C. § 121 - Divisional applications

Text

If two or more independent and distinct inventions are claimed in one application, the Director may require the application to be restricted to one of the inventions. If the other invention is made the subject of a divisional application which complies with the requirements of section 120 it shall be entitled to the benefit of the filing date of the original application. A patent issuing on an application with respect to which a requirement for restriction under this section has been made, or on an application filed as a result of such a requirement, shall not be used as a reference either in the Patent and Trademark Office or in the courts against a divisional application or against the original application or any patent issued on either of them, if the divisional application is filed before the issuance of the patent on the other application. The validity of a patent shall not be questioned for failure of the Director to require the application to be restricted to one invention.

(July 19, 1952, ch. 950, 66 Stat. 800; Pub. L. 93–596, § 1, Jan. 2, 1975, 88 Stat. 1949; Pub. L. 106–113, div. B, § 1000(a)(9) [title IV, § 4732(a)(10)(A)], Nov. 29, 1999, 113 Stat. 1536, 1501A–582; Pub. L. 107–273, div. C, title III, § 13206(b)(1)(B), Nov. 2, 2002, 116 Stat. 1906; Pub. L. 112–29, §§ 4(a)(2), 20(j), Sept. 16, 2011, 125 Stat. 295, 335.)

Notes

Historical and Revision NotesThis section enacts as law existing practice with respect to division, at the same time introducing a number of changes. Division is made discretionary with the Commissioner. The requirements of section 120 are made applicable and neither of the resulting patents can be held invalid over the other merely because of their being divided in several patents. In some cases a divisional application may be filed by the assignee.

Editorial Notes

Amendments2011—Pub. L. 112–29, § 20(j), struck out “of this title” after “120”. Pub. L. 112–29, § 4(a)(2), struck out “If a divisional application is directed solely to subject matter described and claimed in the original application as filed, the Director may dispense with signing and execution by the inventor.” before “The validity of a patent”. 2002—Pub. L. 107–273 made technical correction to directory language of Pub. L. 106–113. See 1999 Amendment note below. 1999—Pub. L. 106–113, as amended by Pub. L. 107–273, substituted “Director” for “Commissioner” wherever appearing. 1975—Pub. L. 93–596 substituted “Patent and Trademark Office” for “Patent Office”.

Statutory Notes and Related Subsidiaries

Effective Date of 2011 AmendmentAmendment by section 4(a)(2) of Pub. L. 112–29 effective upon the expiration of the 1-year period beginning on Sept. 16, 2011, and applicable to any patent application that is filed on or after that effective date, see section 4(e) of Pub. L. 112–29, set out as a note under section 111 of this title. Amendment by section 20(j) of Pub. L. 112–29 effective upon the expiration of the 1-year period beginning on Sept. 16, 2011, and applicable to proceedings commenced on or after that effective date, see section 20(l) of Pub. L. 112–29, set out as a note under section 2 of this title.

Effective Date of 1999 AmendmentAmendment by Pub. L. 106–113 effective 4 months after Nov. 29, 1999, see section 1000(a)(9) [title IV, § 4731] of Pub. L. 106–113, set out as a note under section 1 of this title.

Effective Date of 1975 AmendmentAmendment by Pub. L. 93–596 effective Jan. 2, 1975, see section 4 of Pub. L. 93–596, set out as a note under section 1111 of Title 15, Commerce and Trade.