The second answer to this question suggest patents.google.com as the best way to search for reexamined patents. However, if I search for the classification 'F25B' and 'reexamination', the results haven't actually been reexamined, they just have the word in the text. Is there a better way to search for reexamined patents by classification?

1 Answer 1


USPTO's PatFT provides functionality for this. In particular, the re-examination certificate (REEX, where REEX=YES refers to a certificate of re-examination being present) and current CPC classification class (CPCL) are probably be relevant.

The query REEX/YES and CPCL/F25B seems to provide what you want.

  • Clicking through some of the patents at that link, APT/2 seems to be reissue rather than reexamination, or am I missing something? I can't figure out what other code is reexamination by guessing and checking or googling.
    – ericksonla
    Feb 14, 2017 at 23:11
  • @ericksonla Absolutely right, I embarrassingly misread the question. I have updated my answer now.
    – Maca
    Feb 15, 2017 at 0:54

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