Artikel 28

(1). The applicant shall be given the opportunity to amend the claims, the description, and the drawings, before each designated Office within the prescribed time limit. No designated Office shall grant a patent, or refuse the grant of a patent, before such time limit has expired except with the express consent of the applicant.
(2). The amendments shall not go beyond the disclosure in the international application as filed unless the national law of the designated State permits them to go beyond the said disclosure.
(3). The amendments shall be in accordance with the national law of the designated State in all respects not provided for in this Treaty and the Regulations.
(4). Where the designated Office requires a translation of the international application, the amendments shall be in the language of the translation.