1904.02(f) Mark Must Be Registrable on Principal Register
There is no provision in the Trademark Act for registration of a mark in a request for an extension of protection on the Supplemental Register. If the proposed mark is not registrable on the Principal Register, the extension of protection must be refused. 15 U.S.C. §1141h(a)(4); 37 C.F.R. §§2.47(c), 2.75(c).