What are common-law trademark rights?

Common-law trademark rights are rights that may arise through the use of a trademark in commerce, even without federal registration.

A trademark search is a risk-screening step, not a guarantee of availability or approval. Trademark conflicts can arise even when two marks are not identical. The USPTO may consider similarities in sound, appearance, meaning, overall commercial impression, and the relationship between the parties' goods or services.

Federal database searching is important, but it does not necessarily reveal every relevant use. Some businesses may have common-law trademark rights based on actual use in commerce even without a federal registration. That is why broader searches can include state records, business names, websites, domains, social media, and marketplace use.

Common-law trademark rights are rights that can arise from actual use of a mark in commerce without a federal registration. Those rights are often narrower geographically and can be more difficult to prove than the rights associated with a federal registration.