How should I address correspondence for inter partes reexamination?

For inter partes reexamination correspondence sent via U.S. Postal Service Mail, address it to:

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

For hand-carried or delivery service correspondence, address it to:

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

The MPEP advises: 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:

• inter partes reexamination
• correspondence
• mailing address
• hand-carried correspondence