R.25 EPC Certificate of exhibition

Within four months of filing the European patent application, the applicant shall file the certificate referred to in Article 55, paragraph 2, which:
is issued at the exhibition by the authority responsible for the protection of industrial property at that exhibition; 
states that the invention was in fact displayed there; 
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  
is accompanied by an identification of the invention, duly authenticated by the above-mentioned authority. 
[ R. 159 ]
See decisions of the Enlarged Board of Appeal G 3/98, G 2/99 (Annex I).

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EPC Articles

EPC Implementing Rules

EPO Guidelines - A Formalities Examination

EPO Guidelines - B Search

EPO Guidelines - G Patentability

EPO Guide for Applicants, part II Int. - C The EPO as ISA and SISA

Offical Journal of the EPO

Case Law of the Enlarged Board