Whenever a claim of a patent is invalid, an action may be maintained for the infringement of a claim of the patent which may be valid. The patentee shall recover no costs unless a disclaimer of the invalid claim has been entered at the Patent and Trademark Office before the commencement of the suit.
35 U.S. Code § 288 - Action for infringement of a patent containing an invalid claim
Based on Title 35, U.S.C., 1946 ed., § 71 (R.S. 4922).
The necessity for a disclaimer to recover on valid claims is eliminated. See section 253.
Language is changed.
2011—Pub. L. 112–29 struck out “, without deceptive intention,” after “Whenever”.
1975—Pub. L. 93–596 substituted “Patent and Trademark Office” for “Patent Office”.
Amendment by 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.