How should I address correspondence for ex parte reexamination requests?

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:

Topics: MPEP 2200 - Citation Of Prior Art And Ex Parte Reexamination Of Patents, MPEP 2224 - Correspondence, Patent Law, Patent Procedure
Tags: Correspondence, ex parte reexamination, Hand Delivery, mailing address, USPTO