1601.05 1920 Act Registrations
Registrations under the Act of 1920 are subject to, and entitled to the benefits of, the provisions of the Act of 1946 relating to marks registered on the Supplemental Register, and may not be renewed, unless renewal is required to support a foreign registration. Trademark Act §46(b), 15 U.S.C. §1051 note.
See TMEP §1602.03 regarding the duration of and requirements for maintaining registrations issued under the Act of 1920.