Action for infringement of a patent containing an invalid claim

35 U.S.C. § 288
in effect
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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.

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35 U.S.C. § 288 — Action for infringement of a patent containing an invalid claim | United States Code | Corpus