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35 U.S.C. 291 Derived Interfering patents.

(a) IN GENERAL.--The owner of a patent may have relief by civil action against the owner of another patent that claims the same invention and has an earlier effective filing date, if the invention claimed in such other patent was derived from the inventor of the invention claimed in the patent owned by the person seeking relief under this section.

(b) FILING LIMITATION.--An action under this section may be filed only before the end of the 1–year period beginning on the date of the issuance of the first patent containing a claim to the allegedly derived invention and naming an individual alleged to have derived such invention as the inventor or joint inventor.

The owner of an interfering patent may have relief against the owner of another by civil action, and the court may adjudge the question of validity of any of the interfering patents, in whole or in part. The provisions of the second paragraph of section 146 of this title shall apply to actions brought under this section.

Effective Dates for Changes Made to this Section

IMPLEMENTATION OF FIRST TO FILE
Section 3 of the America Invents Act

EFFECTIVE DATE.--

(1) IN GENERAL.--Except as otherwise provided in this section, the amendments made by this section shall take effect upon the expiration of the 18–month period beginning on the date of the enactment of this Act, and shall apply to any application for patent, and to any patent issuing thereon, that contains or contained at any time--

(A) a claim to a claimed invention that has an effective filing date as defined in Section 100(i) of title 35, United States Code, that is on or after the effective date described in this paragraph; or

(B) a specific reference under section 120, 121, or 365(c) of title 35, United States Code, to any patent or application that contains or contained at any time such a claim.

(2) INTERFERING PATENTS.--The provisions of sections 102(g), 135, and 291 of title 35, United States Code, as in effect on the day before the effective date set forth in paragraph (1) of this subsection, shall apply to each claim of an application for patent, and any patent issued thereon, for which the amendments made by this section also apply, if such application or patent contains or contained at any time--

(A) a claim to an invention having an effective filing date as defined in Section 100(i) of title 35, United States Code, that occurs before the effective date set forth in paragraph (1) of this subsection; or

(B) a specific reference under section 120, 121, or 365(c) of title 35, United States Code, to any patent or application that contains or contained at any time such a claim.