35 U.S.C. 288 Action for infringement of a patent containing an invalid claim.
[Editor Note: Applicable to all proceedings commenced on or after September 16, 2012. See 35 U.S.C. 288 (pre‑AIA) for the law otherwise applicable.]
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.
(Amended Jan. 2, 1975, Public Law 93-596, sec. 1, 88 Stat. 1949; amended Sept. 16, 2011, Public Law 112-29, sec. 20(h), 125 Stat. 284, effective Sept. 16, 2012.)