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.
(July 19, 1952, ch. 950, 66 Stat. 813; Pub. L. 93–596, §1, Jan. 2, 1975, 88 Stat. 1949; Pub. L. 112–29, §20(h), Sept. 16, 2011, 125 Stat. 334.)
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