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LegalText 35 U.S.C. § 21 Filing date and day for taking action us united_states_code code_section 35 PATENTS 2 PROCEEDINGS IN THE PATENT AND TRADEMARK OFFICE 21 35 U.S.C. § 21 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/s21 data/legal/raw/us/code/title-35/usc35.xml 18959ac74f68104b0ac38bd2c54628ce45c3d2ff4614a4348b88443b64ce1099 736cab508592dcf50013a1aed5ab108f72fd8493e76afc46848cdc35da38bbe3 233dfbd6744af332e4ec9e85ac726b345ecb6784300ef6d61e7b45ff6b554b1c 2026-07-04 official
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35 U.S.C. § 21 - Filing date and day for taking action

Text

(a) The Director may by rule prescribe that any paper or fee required to be filed in the Patent and Trademark Office will be considered filed in the Office on the date on which it was deposited with the United States Postal Service or would have been deposited with the United States Postal Service but for postal service interruptions or emergencies designated by the Director.

(b) When the day, or the last day, for taking any action or paying any fee in the United States Patent and Trademark Office falls on Saturday, Sunday, or a Federal holiday within the District of Columbia, the action may be taken, or the fee paid, on the next succeeding secular or business day.

(July 19, 1952, ch. 950, 66 Stat. 794; Pub. L. 93596, § 1, Jan. 2, 1975, 88 Stat. 1949; Pub. L. 97247, § 12, Aug. 27, 1982, 96 Stat. 321; Pub. L. 106113, div. B, § 1000(a)(9) [title IV, § 4732(a)(10)(A)], Nov. 29, 1999, 113 Stat. 1536, 1501A582; Pub. L. 107273, div. C, title III, § 13206(b)(1)(B), Nov. 2, 2002, 116 Stat. 1906.)

Notes

Historical and Revision NotesBased on Title 35, U.S.C., 1946 ed., § 21 (Mar. 2, 1927, ch. 273, § 14, 44 Stat. 1337). “Fixed by statute” is omitted from the corresponding section of the existing statute as unnecessary. Saturday is added as a day on which action need not be taken.

Editorial Notes

Amendments2002—Subsec. (a). Pub. L. 107273 made technical correction to directory language of Pub. L. 106113. See 1999 Amendment note below. 1999—Subsec. (a). Pub. L. 106113, as amended by Pub. L. 107273, substituted “Director” for “Commissioner” in two places. 1982—Pub. L. 97247 substituted “Filing date and day for taking action” for “Day for taking action falling on Saturday, Sunday, or holiday” as section catchline, added subsec. (a), redesignated existing provisions as subsec. (b) and inserted “Federal” after “Sunday, or a”. 1975—Pub. L. 93596 substituted “Patent and Trademark Office” for “Patent Office”.

Statutory Notes and Related Subsidiaries

Effective Date of 1999 AmendmentAmendment by Pub. L. 106113 effective 4 months after Nov. 29, 1999, see section 1000(a)(9) [title IV, § 4731] of Pub. L. 106113, set out as a note under section 1 of this title.

Effective Date of 1982 AmendmentAmendment by Pub. L. 97247 effective six months after Aug. 27, 1982, see section 17(c) of Pub. L. 97247, set out as an Effective Date note under section 294 of this title.

Effective Date of 1975 AmendmentAmendment by Pub. L. 93596 effective Jan. 2, 1975, see section 4 of Pub. L. 93596, set out as a note under section 1111 of Title 15, Commerce and Trade.

Emergency Relief From Postal Situation Affecting Patent CasesRelief as to filing date of patent application or patent and excusal of delayed fees or actions affected by postal situation beginning on Mar. 18, 1970, and ending on or about Mar. 30, 1970, see note set out under section 111 of this title.