In U.S. 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 (Federal Trademark Act) to allow the domestic registration of trademarks that do not meet all the requirements for registration on the Principal Register. Marks on the supplemental list are not protected by trademark law, except to the extent that the listing may bar the registration of similar marks. The listing may be required, however, for a mark to be registered in other countries.
“The supplemental register, in contract generally consists of marks that are merely capable of distinguishing the applicant's goods or services.” Kohler Co. v. Moen, Inc., 1992 U.S. Dist. LEXIS 8438 (N.D. Ill. Mar. 27, 1992) “The term supplemental register refers to the register provided for by sections 1091 through 1096 under title 15 of the United States Code Service [15 USCS §§ 1091-1096].” 15 USCS § 1127