Supplemental Register Is for Marks that Cannot Function as Brand Identifiers.
There are two registers at the United States Trademark Office: The Principal Register and the Supplemental register. The Supplemental Register is a secondary register, which allows for the registration of marks that are not capable of functioning as trademarks (standing alone), but may in the future (after years of use and public recognition) achieve trademark status. In trademark legalese, the Secondary Register is for marks that are not inherently distinctive, and have not achieved secondary meaning.
JERSEY blue crabs, MAINE lobster, FLORIDA oranges, CALIFORNIA raisins, NAPA VALLEY wines, JAMAICAN Rum, CUBAN Cigars. The names identify a location of origin, not a brand (business of origin). These names inherently point to a geographic origin, and not a manufacturer of origin. These examples inherently fail to identify a brand (business of origin), but rather identify a location of origin. The Trademark Act rarely grants monopolies for geographic terms. The exception is when the name acquires secondary meaning. That is, when the public readily associates the name with a brand, rather than the location. For more information on this, visit my article PHILADELPHIA Cream Cheese – Geographically Descriptive Trademark Registrable With Secondary Meaning.