This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.
The official business hours of the U.S. Patent and Trademark Office (USPTO) are 8:30 a.m. to 5:00 p.m., Monday through Friday, excluding federal holidays in the District of Columbia. This is stated directly in the MPEP: The U.S. Patent and Trademark Office (USPTO or Office) working hours are 8:30 a.m. to 5:00 p.m., Monday through Friday, excluding federal holidays in the District of Columbia.
It’s important to note that the Public Search Facility in Alexandria has extended hours, from 8:00 a.m. to 8:00 p.m., Monday through Friday, also excluding federal holidays in the District of Columbia.