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The applicant is obliged to indicate the basis in the application as originally filed for any amendments filed. If no such basis is indicated, the IPER may be established as if the amendments had not been made.

GL-PCT H I 5 Amended sheets

Amendments to the claims, the description and the drawings must be made by filing replacement sheets when, on account of the amendments, the replacement sheet differs from the sheets previously filed.

GL-PCT H I 4 Further opportunity to submit amendments

Together with the reply to the WO‑ISA, the WO-IPEA or the minutes of a telephone consultation, the applicant has, subject to certain exceptions (see GL/PCT‑EPO, C‑VII, 1(d)), the opportunity to submit (further) amendments under Art. 34 to the claims, description and/or drawings.

GL-PCT H I 3 Amendments prior to the start of international preliminary examination

When filing the demand, the applicant should indicate on Form PCT/IPEA/401 which documents should form the basis for international preliminary examination.

GL-PCT H I 2 Amendments before receipt of the search report

There is no right to amend the application until after the international search report has been established. Obvious mistakes, on the other hand, may be corrected (see GL/PCT‑EPO H-IV).

GL-PCT H I 1 Introduction

Notwithstanding the possibility to amend the claims before the IB under Art. 19, an international application may be amended during the PCT Chapter II procedure. There are a number of important aspects to consider.

Firstly, the amendments filed must be such that they can be taken into consideration by the EPO in its capacity as IPEA.