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35 U.S.C. 253 Disclaimer.

(a) IN GENERAL.--Whenever, without any deceptive intention, a claim of a patent is invalid the remaining claims shall not thereby be rendered invalid. A patentee, whether of the whole or any sectional interest therein, may, on payment of the fee required by law, make disclaimer of any complete claim, stating therein the extent of his interest in such patent. Such disclaimer shall be in writing and recorded in the Patent and Trademark Office, and it shall thereafter be considered as part of the original patent to the extent of the interest possessed by the disclaimant and by those claiming under him.

(b) ADDITIONAL DISCLAIMER OR DEDICATION.--In the manner set forth in subsection (a), In like manner any patentee or applicant may disclaim or dedicate to the public the entire term, or any terminal part of the term, of the patent granted or to be granted.

Effective Dates for Changes Made to this Section

REMOVING DECEPTIVE INTENT, ADDING SUBSECTION HEADINGS
Section 20 of the America Invents Act

(l) EFFECTIVE DATE.--The amendments made by this section shall take effect upon the expiration of the 1–year period beginning on the date of the enactment of this Act and shall apply to proceedings commenced on or after that effective date.