What is the difference between the SM (SM), TM (TM) and the R-in-a-circle ()?
These symbols are all used as notice of trademark rights. Under U.S. trademark law, the R-in-a-circle symbol () may only be used in connection with a federally registered trademark. By “federally registered” we mean that the trademark owner filed a trademark registration application with the US Patent & Trademark Office (USPTO) and has been granted a registration. In contrast, the TM and SM symbols, for trademarks and service marks respectively, are often used with marks that have been filed with the USPTO and are awaiting registration or simply to highlight the owners claim to exclusive rights.
