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Reexamination Certificate

Authority Listing

The Reexamination Certificates File contains a listing of all Reexamination Certificates for US patent documents and lists the following fields:

Document Number
Publication Date
Kind of Document Code (B1, B2, C1, C2, F1 and F2)

The Reexamination Certificate File is normally updated on a monthly basis.

In addition,  layout information for the Reexamination Certificates File is provided. Additional information regarding Reexamination Certificates can be found on the list at the following location:

Click here to download the zipped file (last updated December 31, 2014). Some contents linked to on this page require a plug-in for ZIP File .

United States Patent and Trademark Office
This page is owned by Central Reexamination Unit.
Last Modified: 12/31/2014 2:48:15 PM