37 CFR 1.530 Statement by patent owner in ex parte reexamination; amendment by patent owner in ex parte or inter partes reexamination; inventorship change in ex parte or inter partes reexamination.

(a) Except as provided in § 1.510(e), no statement or other response by the patent owner in an ex parte reexamination proceeding shall be filed prior to the determinations made in accordance with § 1.515 or § 1.520. If a premature statement or other response is filed by the patent owner, it will not be acknowledged or considered in making the determination.

(b) The order for ex parte reexamination will set a period of not less than two months from the date of the order within which the patent owner may file a statement on the new question of patentability, including any proposed amendments the patent owner wishes to make.

(c) Any statement filed by the patent owner shall clearly point out why the subject matter as claimed is not anticipated or rendered obvious by the prior art patents or printed publications, either alone or in any reasonable combinations. Where the reexamination request was filed by a third party requester, any statement filed by the patent owner must be served upon the ex parte reexamination requester in accordance with § 1.248.

http://www.uspto.gov/web/offices/pac/mpep/documents/2200_2249.htm#sect2249

Be well