37 CFR § 2.141 - Ex parte appeals from action of trademark examining attorney.
(a) An applicant may, upon final refusal by the trademark examining attorney, appeal to the Trademark Trial and Appeal Board upon payment of the prescribed fee for each class in the application for which an appeal is taken, within six months of the date of issuance of the final action. A second refusal on the same grounds may be considered as final by the applicant for purpose of appeal.
(b) The applicant must pay an appeal fee for each class from which the appeal is taken. If the applicant does not pay an appeal fee for at least one class of goods or services before expiration of the six-month statutory filing period, the application will be abandoned. In a multiple-class application, if an appeal fee is submitted for fewer than all classes, the applicant must specify the class(es) in which the appeal is taken. If the applicant timely submits a fee sufficient to pay for an appeal in at least one class, but insufficient to cover all the classes, and the applicant has not specified the class(es) to which the fee applies, the Board will issue a written notice setting a time limit in which the applicant may either pay the additional fees or specify the class(es) being appealed. If the applicant does not submit the required fee or specify the class(es) being appealed within the set time period, the Board will apply the fee(s) to the class(es) in ascending order, beginning with the lowest numbered class.