In the course of examining a trademark application, the Examining Attorney may identify issues that preclude registration of your mark. They may be substantive (i.e., there is a fundamental flaw with the trademark you wish to register) or procedural (i.e., there was a problem with your application). Any issues the Examining Attorney identifies will be described in an "Office Action," to which you must respond within six (6) months of receipt.
After you respond to the Office Action, the Examiner may maintain the rejection of your application. If Status Code 644 is triggered, it means that the examiner has prepared a final refusal of your registration, and is in the process of mailing it to you. For more information on the Trademark Application Process, visit:
For more information on possible grounds for rejection, visit: