A.87 EPC Priority right

Any person who has duly filed, in or for 
any State party to the Paris Convention for the Protection of Industrial Property or 
any Member of the World Trade Organization,  
an application for a patent, a utility model or a utility certificate, or his successor in title, shall enjoy, for the purpose of filing a European patent application in respect of the same invention, a right of priority during a period of twelve months from the date of filing of the first application. 
Every filing that is equivalent to a regular national filing under the national law of the State where it was made or under bilateral or multilateral agreements, including this Convention, shall be recognised as giving rise to a right of priority. 
A regular national filing shall mean any filing that is sufficient to establish the date on which the application was filed, whatever the outcome of the application may be. 
A subsequent application in respect of the same subject-matter as a previous first application and filed in or for the same State shall be considered as the first application for the purposes of determining priority, provided that, at the date of filing the subsequent application, the previous application has been withdrawn, abandoned or refused, without being open to public inspection and without leaving any rights outstanding, and has not served as a basis for claiming a right of priority. The previous application may not thereafter serve as a basis for claiming a right of priority. 
If the first filing has been made with an industrial property authority which is not subject to the Paris Convention for the Protection of Industrial Property or the Agreement Establishing the World Trade Organization, paragraphs 1 to 4 shall apply if that authority, according to a communication issued by the President of the European Patent Office, recognises that a first filing made with the European Patent Office gives rise to a right of priority under conditions and with effects equivalent to those laid down in the Paris Convention.
[ Art. 66 122 R. 52 57 59 136 ]
Amended by the Act revising the European Patent Convention of 29.11.2000. 
See decisions/opinions of the Enlarged Board of Appeal G 3/93, G 2/95, G 2/98, G 1/03, G 2/03, G 1/16 (Annex I).

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EPC Articles

EPC Implementing Rules

EPO Guidelines Foreword

EPO Guidelines - A Formalities Examination

EPO Guidelines - E General Procedural Matters

EPO Guidelines - F The European Patent Application

EPO PCT GL - F (not assigned)

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

Offical Journal of the EPO

Case Law Book: II Conditions to be met by an Application

Case Law Book: III Amendments

Case Law of the Enlarged Board

General Case Law