request reexamination

See: appeal
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Any person at any time" may request reexamination, and the PTO will grant any request that raises a "substantial new question of patentability" regarding the patent's novelty or obviousness.
Parties may request reexamination by submitting individual prior art references that they believe are relevant to the validity of one or more of the patent's claims.
Ex-parte reexamination is a process wherein the patent owner, a third party, or the Director of Patents of the Patent Office may request reexamination of a granted patent upon showing of a substantial new question of patentability.