37 CFR § 41.71 - Rebuttal brief.

(a) Within one month of the examiner's answer, any appellant may once file a rebuttal brief.

(b)

(1) The rebuttal brief of the owner may be directed to the examiner's answer and/or any respondent brief.

(2) The rebuttal brief of the owner shall not include any new or non-admitted amendment, or an affidavit or other evidence. See § 1.116 of this title for amendments, affidavits or other evidence filed after final action but before or on the same date of filing an appeal and § 41.63 for amendments, affidavits or other evidence filed after the date of filing the appeal.

(c)

(1) The rebuttal brief of any requester may be directed to the examiner's answer and/or the respondent brief of the owner.

(2) The rebuttal brief of a requester may not be directed to the respondent brief of any other requester.

(3) No new ground of rejection can be proposed by a requester.

(4) The rebuttal brief of a requester shall not include any new or non-admitted affidavit or other evidence. See § 1.116(d) of this title for affidavits or other evidence filed after final action but before or on the same date of filing an appeal and § 41.63(c) for affidavits or other evidence filed after the date of filing the appeal.

(d) The rebuttal brief must include a certification that a copy of the rebuttal brief has been served in its entirety on all other parties to the proceeding. The names and addresses of the parties served must be indicated.

(e) If a rebuttal brief is timely filed under paragraph (a) of this section but does not comply with all the requirements of paragraphs (a) through (d) of this section, appellant will be notified of the reasons for non-compliance and provided with a non-extendable period of one month within which to file an amended rebuttal brief. If the appellant does not file an amended rebuttal brief during the one-month period, or files an amended rebuttal brief which does not overcome all the reasons for non-compliance stated in the notification, that appellant's rebuttal brief and any amended rebuttal brief by that appellant will not be considered.