"Patent reexamination" refers to the process of reviewing and reevaluating an existing patent. It is done to ensure the patent is valid, meets all requirements, and hasn't unjustly restricted other inventors from using similar ideas. Full definition
The PTO recently granted EFF's fifth patent reexamination request. (eff.org)
According to the Manual of Patent Examining Procedure, information on patent reexamination proceedings are open to inspection by the general public.27 The most recent filing data includes both inter partes and ex parte reexamination proceedings through December 31, 2007.28 (eff.org)
Gardella, now a partner at Oblon Spivak, focuses his litigation practice on patent reexamination disputes. (amlawdaily.typepad.com)