According to MPEP 2014, the individuals who have a duty of disclosure in reexamination proceedings are: The patent owner Each attorney or agent representing the patent owner Every other individual who is substantively involved on behalf of the patent owner in the reexamination proceeding As stated in 37 CFR 1.555(a): "The individuals who have a duty to disclose to the Office all information known to them to be material to patentability in a reexamination proceeding are the patent owner, each attorney or agent who represents the patent owner, and every other individual who is substantively involved on behalf of the patent owner in a reexamination proceeding." This duty is a continuing obligation throughout the reexamination proceedings. To learn more: Duty of Disclosure Reexamination Patent Owner Patent Attorney USPTO