503.04 Address for Submitting Documents for Recording
To expedite recordation, new owners are encouraged to file requests to record documents with the Assignment Recordation Branch electronically through ETAS, on the USPTO website, at http://etas.uspto.gov. Paper documents and cover sheets to be recorded in the Assignment Recordation Branch should be sent to Mail Stop Assignment Recordation Services, Director of the United States Patent and Trademark Office, P. O. Box 1450, Alexandria VA 22313-1450. 37 C.F.R. §§2.190(c) and 3.27.