(a) (1) An appeal filed under the provisions of § 2.141(a) from the final refusal of an application must be filed within the time provided in § 2.62(a) . (2) An appeal filed under the provisions of § 2.141(b) from an expungement or reexamination proceeding must be filed within three months from the issue date of the final Office action. (3) An appeal is taken by filing a notice of appeal, as prescribed in § 2.126 , and paying the appeal fee. (b) (1) The brief of appellant shall be filed within sixty