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In United States trademark law, the Supplemental Register is the secondary register of trademarks maintained by the United States Patent and Trademark Office. It was established in 1946 by Subchapter II of the Lanham Act, to allow the domestic registration of trademarks that do not meet all the requirements for registration on the Principal Register, so that the holder(s) of such a mark could register it in another country. This was necessary because under the Paris Convention for the Protection of Industrial Property foreign registration was not permitted in the absence of domestic registration, and the trademark laws of countries outside the U.S. often have less stringent registration requirements for marks.
The only requirement for registration on the Supplemental Register is that a mark be capable of distinguishing goods or services, not that it actually serve such a function. Registration on the Supplemental Register does not confer any additional rights on the owner of the registration beyond those provided by common law for the mark (if any). Registrations on the Supplemental Register are not subject to opposition proceedings, but they may be canceled at any time by a third party through a court proceeding or through a cancellation proceeding in the U.S. Patent and Trademark Office.
Owners of the registrations on the Supplemental Register are still permitted to sue for trademark infringement based upon their common law rights (if any), but must prove that the registered term actually functions as mark. Unlike a mark registered on the Principal Register, the Supplemental Registration provides no evidence of trademark rights in the registered term in a court proceeding.
- Levine, Gerald R. (December 29, 2009). "Trademark on the Supplemental Register (By Itself) Does Not Satisfy Jurisdiction Requirement". iplegalcorner. Retrieved May 26, 2016.
- Muscovitch, Zak (January 26, 2015). "When a Trademark is Not a Trademark". Domain Name Lawyer Blog. Retrieved May 26, 2016.