Trademarks rights must be maintained through actual lawful use of the trademark. If
you are already using the mark in commerce, you will have to submit a "proof of use" to
the USPTO. If you are not yet using the mark in commerce and are filing an "Intent to
Use" based application, you will still have to submit a "proof of use" at a later stage. The
USPTO will not register the mark unless the applicant submits a valid proof of use of its
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