37 C.F.R. § 2.176
The matters in §§ 2.171 to 2.175 will be considered in the first instance by the Post Registration examiners, except for requests to amend registrations involved in inter partes proceedings before the Trademark Trial and Appeal Board, as specified in § 2.173(a) , which shall be considered by the Board. If an action of the examiner is adverse, the owner of the registration may petition the Director to review the action under § 2.146 . If the owner does not respond to an adverse action of the examiner within six months of the date of issuance, the matter will be considered abandoned.
37 C.F.R. §2.176
Part 3 pertaining to both patents and trademarks is placed in the grouping pertaining to patents regulations.
Part 4 is placed in the separate grouping of parts pertaining to patents regulations.
Part 5 is placed in the separate grouping of parts pertaining to patents regulations.