What is the central facsimile number for patent application-related correspondence at the USPTO?

The central facsimile number for patent application-related correspondence at the USPTO is (571) 273-8300. According to MPEP 502.01:

All patent application related correspondence transmitted by facsimile must be directed to the central facsimile number, with a few exceptions below. The central facsimile number is (571) 273-8300.

This central number should be used for most patent-related correspondence, including replies to Office actions and after-final amendments. However, there are specific exceptions for certain types of correspondence that should be sent to other facsimile numbers, as outlined in the MPEP.

To learn more:

• central facsimile number
• USPTO communication
• patent application
• facsimile transmission