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Once an application or a registration is in the Trademark Registry, the trademark is used to bar other, subsequent applications from registration in the USPTO. This means that, once filed, your trademark gains the benefit of that earlier filing date to "overcome" other, later trademarks that attempt to register.
The United States primarily follows a "first-to-use" trademark system, where the first party to use a trademark in commerce generally has priority over others who may later attempt to use or register the same or a confusingly similar mark. However, the U.S. system also incorporates some "first-to-file" elements that provide certain benefits to trademark applicants:
However, these "first-to-file" benefits are subject to certain limitations:
So while the U.S. is primarily a "first-to-use" country, filing an application early can provide important benefits and nationwide priority, subject to the rights of prior users in their geographic areas of use. This hybrid approach aims to balance the interests of early adopters and trademark applicants.
A trademark application can be challenged if a subsequent filer started using the mark previously. However, that is a big process and would take place during opposition, not through Examination. Oftentimes, we have seen applications pass through the system to allowance, even though a previous, common-law use existed. In that case, the earlier user cannot be prevented from using the trademark, but they can be prevented from expanding their use geographically, for example.