US Code

Public Law 119-73 (01/23/2026)

35 U.S.C. § 311

Inter partes review

(a)

In General .—

Subject to the provisions of this chapter, a person who is not the owner of a patent may file with the Office a petition to institute an inter partes review of the patent. The Director shall establish, by regulation, fees to be paid by the person requesting the review, in such amounts as the Director determines to be reasonable, considering the aggregate costs of the review.
(b)

Scope .—

A petitioner in an inter partes review may request to cancel as unpatentable 1 or more claims of a patent only on a ground that could be raised under section 102 or 103 and only on the basis of prior art consisting of patents or printed publications.
(c)

Filing Deadline .—

A petition for inter partes review shall be filed after the later of either—
(1)
the date that is 9 months after the grant of a patent; or
(2)
if a post-grant review is instituted under chapter 32, the date of the termination of such post-grant review.

Pub. L. 106–113, div. B, § 1000(a)(9) [title IV, § 4604(a)]113 Stat. 1536Pub. L. 107–273, div. C, title III, § 13202(a)(1)116 Stat. 1901Pub. L. 112–29, § 6(a)125 Stat. 299Pub. L. 112–274, § 1(d)(2)126 Stat. 2456(Added , , , 1501A–567; amended , (c)(1), , , 1902; , , ; , , .)

Editorial Notes

Amendments

Pub. L. 112–2742013—Subsec. (c)(1). struck out “or issuance of a reissue of a patent” after “grant of a patent”.

Pub. L. 112–292011— amended section generally. Prior to amendment, section related to request for inter partes reexamination.

Pub. L. 107–273, § 13202(c)(1)Pub. L. 106–1132002—, made technical correction to directory language of , which enacted this section.

Pub. L. 107–273, § 13202(a)(1)(A)Subsec. (a). , substituted “third-party requester” for “person”.

Pub. L. 107–273, § 13202(a)(1)(B)Subsec. (c). , substituted “The” for “Unless the requesting person is the owner of the patent, the”.

Statutory Notes and Related Subsidiaries

Effective Date of 2013 Amendment

Pub. L. 112–274section 1(n) of Pub. L. 112–274section 5 of this titleAmendment by effective , and applicable to proceedings commenced on or after such date, see , set out as a note under .

Effective Date of 2011 Amendment

Pub. L. 112–29, § 6(c)(2)125 Stat. 304

“(A)

In general .—

section 319 of this titleThe amendments made by subsection (a) [enacting and amending this section and sections 312 to 318 of this title] shall take effect upon the expiration of the 1-year period beginning on the date of the enactment of this Act [] and shall apply to any patent issued before, on, or after that effective date.
“(B)

Graduated implementation .—

The Director [Under Secretary of Commerce for Intellectual Property and Director of the United States Patent and Trademark Office] may impose a limit on the number of inter partes reviews that may be instituted under chapter 31 of title 35, United States Code, during each of the first 4 1-year periods in which the amendments made by subsection (a) are in effect, if such number in each year equals or exceeds the number of inter partes reexaminations that are ordered under chapter 31 of title 35, United States Code, in the last fiscal year ending before the effective date of the amendments made by subsection (a).”
, , , provided that:

Effective Date

Pub. L. 106–113section 41 of this titleSection effective , and applicable to any patent issuing from an original application filed in the United States on or after that date, see section 1000(a)(9) [title IV, § 4608(a)] of , set out as an Effective Date of 1999 Amendment note under .

Regulations

Pub. L. 112–29, § 6(c)(1)125 Stat. 304

“The Director [Under Secretary of Commerce for Intellectual Property and Director of the United States Patent and Trademark Office] shall, not later than the date that is 1 year after the date of the enactment of this Act [], issue regulations to carry out chapter 31 of title 35, United States Code, as amended by subsection (a) of this section.”
, , , provided that:

Applicability of Filing Deadline

Pub. L. 112–274, § 1(d)(1)126 Stat. 2456

Section 311(c) of title 35Pub. L. 112–2935 U.S.C. 100“, United States Code, shall not apply to a petition to institute an inter partes review of a patent that is not a patent described in section 3(n)(1) of the Leahy-Smith America Invents Act [] ( note).”
, , , provided that:

Report to Congress

Pub. L. 106–113, div. B, § 1000(a)(9) [title IV, subtitle F, § 4606]113 Stat. 1536, , , 1501A–571, required the Under Secretary of Commerce for Intellectual Property and Director of the United States Patent and Trademark Office to submit to Congress a report on possible inequities of certain inter partes reexamination proceedings no later than 5 years after .