37 CFR 7.39
Acknowledgment of receipt of affidavit or declaration of use in commerce or excusable nonuse.

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§7.39 Acknowledgment of receipt of affidavit or declaration of use in commerce or excusable nonuse.

(a)

The Office will issue a notice that states an affidavit or declaration of use in commerce or excusable nonuse is acceptable or if the affidavit or declaration is refused, an Office action that states the reason(s) for refusal.

(b)

A Response to a refusal under paragraph (a) of this section must be filed within six months of the mailing date of the Office action, or before the end of the filing period set forth in section 71(a) of the Act, whichever is later. The Office will cancel the extension of protection if no response is filed within this time period.