Where an applicant states when filing an application that the invention which is the subject of the application has been displayed at an official or officially recognised international exhibition falling within the terms of the Convention on international exhibitions, that applicant must file a certificate of exhibition within four months of the filing of the European patent application. The exhibitions recognised are published in the Official Journal. The certificate, must:[Art. 55(1)(b); Art. 55(2); Rule 25; ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/a_iv_3_1.htm
Date retrieved: 17 May 2021