The symbol of a circled letter R after a trademark name or graphic image means that the preceding trademark has been registered. Various typographic symbols indicate copyrights and patents. The presence or absence of a symbol does not change the validity of the registration, but the best practice is to use circle‑R or circle‑C for copyrights every time you mention your intellectual property in print. These symbols give legal grounds for claiming damages in trademark litigation. The following is a list of some typical marks you can use on a web page, in written content, or even in a marketing letter.
- TM: The TM or trademark symbol indicates an unregistered trademark for one of 34 different classes of products. Owners use this symbol to claim the preceding name or logo as the Trademark of their product.
- SM: The SM or service mark symbol is similar to the TM symbol except it indicates a claim to a mark for a service (one of 11 classes of service) rather than a tangible product.
- ®: Use the ® symbol once you’ve registered your trademark or service mark. It shows that the country authority has approved the registration.
- ©: Use the © symbol to indicate copyrighted material. The copyright notice should appear on the material as Copyright © followed by the date the work was created, the copyright owner’s name, a period, and finally “All Rights Reserved.” Like this: Copyright © 2021, John Smith. All Rights Reserved. Use it whether the copyright has been registered or not.
- Patent Pending: The phrase Patent Pending shows that you filed a patent application but cannot guarantee the application's approval.