PCT International Search and Preliminary Examination Guidelines
PART II THE INTERNATIONAL APPLICATION
Chapter 8 Rule 91 - Obvious Mistakes in Documents
Invitation to the Applicant to Request Rectification
8.13 If an International Authority discovers what appears to be an obvious mistake in the international application or any other paper submitted by the applicant, it may (optionally using Form PCT/ISA/216 or PCT/IPEA/411, as applicable) invite the applicant to submit a request for rectification to the authority competent to authorize the rectification (Rule 91.1(b) and (h)). Although Rule 91.1(h) allows the International Authorities to invite rectifications, it is not expected that such invitations will be issued since any mistake which can be rectified under Rule 91 will not be an impediment to establishing the search report and should not affect the substance of any written opinion or international preliminary examination report.