An applicant who wants to contest a final refusal from an examining attorney may file an appeal to the Trademark Trial and Appeal Board. An appeal is taken by filing a Notice of Appeal and paying the appeal fee within six months of the mailing date of the action from which the appeal is taken. 15 U.S.C. Section 1070; 37 C.F.R. Section 2.142(a).
Source: U.S. Patent and Trademark Office.