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15 U.S. Code § 1058. Duration, affidavits and fees
(a) Time periods for required affidavitsEach registration shall remain in force for 10 years, except that the registration of any mark shall be canceled by the Director unless the owner of the registration files in the United States Patent and Trademark Office affidavits that meet the requirements of subsection (b), within the following time periods:
(1)
Within the 1-year period immediately preceding the expiration of 6 years following the date of registration under this chapter or the date of the publication under section 1062(c) of this title.
(2)
Within the 1-year period immediately preceding the expiration of 10 years following the date of registration, and each successive 10-year period following the date of registration.
(3)
The owner may file the affidavit required under this section within the 6-month grace period immediately following the expiration of the periods established in paragraphs (1) and (2), together with the fee described in subsection (b) and the additional grace period surcharge prescribed by the Director.