U.S. Patent Act

..Part III. Patents and Protection of Patent Rights

....Chapt. 29. Remedies for Infringement

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Sect.288. Action for infringement of a patent containing an invalid claim

Whenever, without deceptive intention, 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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