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use-based applicationThere are four filing bases on which a trademark application may be based. One filing basis is use of the mark in commerce (the other three are filing based on an intent-to-use the mark in commerce, filing based on a pending foreign application, and filing based on a foreign registration). Applicants who file based on use in commerce must be using the mark they wish to register with the goods or services in the application prior to or at the time of filing the application.
Source: U.S. Patent and Trademark Office