An applicant or registrant must provide and keep current the address of its domicile, as defined in § 2.2(o) .
37 C.F.R. §2.189
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.