815.01 Marks Eligible for Principal Register Not Registrable on Supplemental Register
A mark that is clearly eligible for the Principal Register may not be registered on the Supplemental Register. An application requesting registration on the Supplemental Register must be amended to the Principal Register, or refused registration, if the mark is registrable on the Principal Register. Daggett & Ramsdell, Inc. v. I. Posner, Inc., 115 USPQ 96 (Comm’r Pats. 1957).
See TMEP §§816–816.05 regarding amendments to the Supplemental Register.