906 Federal Registration Notice
The owner of a mark registered in the United States Patent and Trademark Office may give notice that the mark is registered by displaying with the mark the words "Registered in United States Patent and Trademark Office," the abbreviation "Reg. U.S. Pat. & Tm. Off.," or the letter R enclosed within a circle, ®. 15 U.S.C. §1111.
The registration symbol should be used only on or in connection with the goods/services/collective membership organization listed in the registration.
The federal registration symbol may not be used with marks that are not actually registered in the USPTO. Even if an application is pending, the registration symbol may not be used until the mark is registered.
Registration in a state of the United States does not entitle a person to use the federal registration notice. Du-Dad Lure Co. v. Creme Lure Co., 143 USPQ 358 (TTAB 1964).
A party may use terms such as "trademark," "trademark applied for," "TM" and "SM" regardless of whether a mark is registered. These are not official or statutory symbols of federal registration.