Patent Law FAQ

For ex parte reexamination requests filed under 35 U.S.C. 302 and subsequent correspondence, the MPEP provides specific addressing instructions:

For mail sent via U.S. Postal Service:

• Mail Stop “Ex Parte Reexam”
• Attn: Central Reexamination Unit
• Commissioner for Patents
• P.O. Box 1450
• Alexandria, VA 22313-1450

For hand-carried or delivery service submissions:

• Customer Service Window
• Randolph Building
• 401 Dulany Street
• Alexandria, VA 22314

The MPEP states: “It is strongly recommended that the Mail Stop information be placed in a prominent position on the first page of each paper being filed utilizing a sufficiently large font size that will direct attention to it.”

To learn more:

• ex parte reexamination
• correspondence
• USPTO
• mailing address
• hand delivery