The USPTO PatFT page for Patent Number Search lists three examples for reexamination patent numbering:
Re-examination — RX29,194 RE29183 RE00125
However, if you type in those three “example” numbers into the search box, you get a “PN/RX29,194: 0 patents” error and two reissue patents. It is odd that the USPTO examples aren’t valid…
Anyone know of a valid re-examination number (for a project I’m working on)?