About Intellectual Property IP Training IP Outreach IP for… IP and... IP in... Patent & Technology Information Trademark Information Industrial Design Information Geographical Indication Information Plant Variety Information (UPOV) IP Laws, Treaties & Judgements IP Resources IP Reports Patent Protection Trademark Protection Industrial Design Protection Geographical Indication Protection Plant Variety Protection (UPOV) IP Dispute Resolution IP Office Business Solutions Paying for IP Services Negotiation & Decision-Making Development Cooperation Innovation Support Public-Private Partnerships The Organization Working with WIPO Accountability Patents Trademarks Industrial Designs Geographical Indications Copyright Trade Secrets WIPO Academy Workshops & Seminars World IP Day WIPO Magazine Raising Awareness Case Studies & Success Stories IP News WIPO Awards Business Universities Indigenous Peoples Judiciaries Genetic Resources, Traditional Knowledge and Traditional Cultural Expressions Economics Gender Equality Global Health Climate Change Competition Policy Sustainable Development Goals Enforcement Frontier Technologies Mobile Applications Sports Tourism PATENTSCOPE Patent Analytics International Patent Classification ARDI – Research for Innovation ASPI – Specialized Patent Information Global Brand Database Madrid Monitor Article 6ter Express Database Nice Classification Vienna Classification Global Design Database International Designs Bulletin Hague Express Database Locarno Classification Lisbon Express Database Global Brand Database for GIs PLUTO Plant Variety Database GENIE Database WIPO-Administered Treaties WIPO Lex - IP Laws, Treaties & Judgments WIPO Standards IP Statistics WIPO Pearl (Terminology) WIPO Publications Country IP Profiles WIPO Knowledge Center WIPO Technology Trends Global Innovation Index World Intellectual Property Report PCT – The International Patent System ePCT Budapest – The International Microorganism Deposit System Madrid – The International Trademark System eMadrid eMadrid Reference Article 6ter (armorial bearings, flags, state emblems) Hague – The International Design System eHague Lisbon – The International System of Appellations of Origin and Geographical Indications eLisbon UPOV PRISMA Mediation Arbitration Expert Determination Domain Name Disputes Centralized Access to Search and Examination (CASE) Digital Access Service (DAS) WIPO Pay Current Account at WIPO WIPO Assemblies Standing Committees Calendar of Meetings WIPO Official Documents Development Agenda Technical Assistance IP Training Institutions COVID-19 Support National IP Strategies Policy & Legislative Advice Cooperation Hub Technology and Innovation Support Centers (TISC) Technology Transfer Inventor Assistance Program WIPO GREEN WIPO's Pat-INFORMED Accessible Books Consortium WIPO for Creators WIPO ALERT Member States Observers Director General Activities by Unit External Offices Job Vacancies Procurement Results & Budget Financial Reporting Oversight

PCT International Search and Preliminary Examination Guidelines


Chapter 8  Rule 91 – Obvious Mistakes in Documents

Mistakes that Cannot Be Rectified Under Rule 91

8.08  Under Rule 91.1(g), a mistake shall not be rectified if:

Rule 91.1(g)(i)

(i) the mistake lies in the omission of one or more entire elements of the international application referred to in Article 3(2) (request, description, claims, drawings, or abstract) or one or more entire sheets of the international application;

Rule 91.1(g)(ii)

(ii) the mistake is in the abstract;

Rule 91.1(g)(iii)

(iii) the mistake is in an amendment under Article 19, unless the International Preliminary Examining Authority is competent to authorize the rectification because a demand for international preliminary examination has been made and has not been withdrawn and the date on which international preliminary examination is to start in accordance with Rule 69.1 has passed; or

Rule 91.1(g)(iv)

(iv) the mistake is in a priority claim or in a notice correcting or adding a priority claim under Rule 26bis.1(a), where the rectification of the mistake would cause a change in the priority date.

Missing Elements or Sheets

8.09  However, it is noted that provisions for providing a missing element or sheet to the receiving Office are provided in Rules 20.3 to 20.8. An applicant may, under Rule 38.3, propose modifications to the abstract established by the International Searching Authority. Changes to the priority claim, other than a change in the priority date, may be made under either Rule 91 or Rule 26bis.1(a).

Correction of Priority Claims

Rule 26bis.2(e)

8.10  Corrections or additions of priority claims that would affect the priority date may only be effected in accordance with Rule 26bis. However, where the applicant wishes to correct or add a priority claim but the time limit under Rule 26bis.1 has expired, the applicant may request the International Bureau to publish information concerning the matter. Any such request must be made prior to the expiration of 30 months from the priority date and is subject to the payment of a special fee.