Until the fee for granting and printing the patent specification has been paid, the applicant may request the rectification of errors of expression or transcription as well as material errors found in the documents filed. The Institute may require justification of the reality of the material error to be corrected and, where appropriate, of the meaning of the correction requested.
If the request relates to the description, claims or drawings, the rectification shall only be authorised if it is obviously necessary, as no other text or layout could clearly have been considered by the applicant.
The request shall be made in writing and shall include the text of the proposed amendments; it shall be admissible only if it is accompanied by proof of payment of the fee due.