What Is a Common Law Trademark?
A common law trademark is a trademark that is established through actual use in commerce, without formal registration with the USPTO or any state trademark office. Under U.S. trademark law, you automatically acquire certain trademark rights simply by being the first to use a distinctive mark in connection with goods or services in a particular geographic area.
These common law rights are symbolized by the ™ symbol, which can be used by anyone claiming trademark rights, regardless of whether the mark is registered. Common law rights arise at the moment you begin using the mark in commerce and are limited to the geographic area where the mark is actually used or known.
Limitations of Common Law Trademark Rights
While common law trademark rights provide some baseline protection, they have significant limitations compared to federal registration:
- Geographic Limitation: Common law rights only extend to the geographic area where you actually use the mark and have established goodwill. Another party could potentially register and use the same mark in a different geographic area.
- No Constructive Notice: Unlike federal registration, common law rights do not provide constructive notice to others of your trademark claim. This means others may adopt similar marks without knowledge of your prior use.
- Burden of Proof: Without registration, you bear the full burden of proving your trademark rights in any dispute, including first use date, geographic scope of use, and distinctiveness.
- No ® Symbol: Only federally registered marks can use the ® symbol. Common law marks are limited to the ™ designation.
- Limited Court Access: Without federal registration, you generally cannot bring a trademark infringement action in federal court under the Lanham Act.
- No Customs Protection: Common law marks cannot be recorded with U.S. Customs to prevent importation of infringing goods.
Common Law vs. Federal Registration: Why Register?
Given the limitations of common law rights, federal trademark registration with the USPTO is strongly recommended for any business that is serious about protecting its brand. Registration establishes nationwide priority, creates legal presumptions in your favor, and provides powerful enforcement tools that are simply not available to unregistered mark owners. The modest investment in federal registration provides peace of mind and legal protection that common law rights alone cannot match.