Section 104.2 - Address for mail and service; telephone number(a) Mail under this part should be addressed to the Office of the General Counsel, United States Patent and Trademark Office, P.O. Box 1450, Alexandria, Virginia 22313-1450.(b) Service by hand should be made during business hours to the Office of the General Counsel, 10B20, Madison Building East, 600 Dulany Street, Alexandria, Virginia.(c) The Office of the General Counsel may be reached by telephone at 571-272-7000 during business hours.66 FR 47389, Sept. 12, 2001, as amended at 70 FR 10490, Mar. 4, 2005; 75 FR 36295, June 25, 2010