Regulations under the PCT
(a) The applicant shall, if he so wishes, exercise the right under Article 41 to amend the claims, the description and the drawings, before the elected Office concerned within one month from the fulfillment of the requirements under Article 39(1)(a), provided that, if the transmittal of the international preliminary examination report under Article 36(1) has not taken place by the expiration of the time limit applicable under Article 39, he shall exercise the said right not later than four months after such expiration date. In either case, the applicant may exercise the said right at any later time if so permitted by the national law of the said State.
(b) In any elected State in which the national law provides that examination starts only on special request, the national law may provide that the time limit within or the time at which the applicant may exercise the right under Article 41 shall be the same as that provided by the national law for the filing of amendments in the case of the examination, on special request, of national applications, provided that such time limit shall not expire prior to, or such time shall not come before, the expiration of the time limit applicable under paragraph (a).
The provisions of Rules 6.5 and 13.5 shall apply, mutatis mutandis, before elected Offices. If the election was made before the expiration of the 19th month from the priority date, the reference to the time limit applicable under Article 22 is replaced by a reference to the time limit applicable under Article 39.