Once a Federal registration is issued, the registrant may give notice of registration by using the ® symbol, or the phrase "Registered in U.S. Patent and Trademark Office" or "Reg. U.S. Pat. & Tm. Off." Although it is not required, prior to registration many trademark owners use a TM or SM (if the mark identifies a service) symbol to indicate a claim of ownership, even if no Federal trademark application is pending.
Information Courtesy: The United States Patent and Trademark Office.
While Federal registration is not necessary for trademark protection, registration on the Principal Register does provide certain advantages:
Send Questions and Comments to info@trademarkbureau.com