Rule 25

Within four months of filing the European patent application, the applicant shall file the certificate referred to in Article 55, paragraph 2, which:

a) is issued at the exhibition by the authority responsible for the protection of industrial property at that exhibition;

b) states that the invention was in fact displayed there;

c) states the opening date of the exhibition and, where the invention was disclosed later than on that date, the date on which the invention was first disclosed; and

d) is accompanied by an identification of the invention, duly authenticated by the above-mentioned authority.