(1) A person who has duly filed in or for any State party to the Paris Convention for the Protection of Industrial Property, an application for a patent or for the registration of a utility model or for a utility certificate or for an inventor's certificate, or his successors 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.
(2) 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.
(3) By a regular national filing is meant any filing that is sufficient to establish the date on which the application was filed, whatever may be the outcome of the application.
(4) A subsequent application for the same subject-matter as a previous first application and filed in or in respect of 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priority, provided that, at the date of filing the subsequent application, the previous application has been withdrawn, abandoned or refused, without being open to public inspection and without leaving any rights outstanding, and has not served as a basis for claiming a right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.
(5) If the first filing has been made in a State which is not a party to the Paris Convention for the Protection of Industrial Property, paragraphs 1 to 4 shall apply only in so far as that State, according to a notification published by the Administrative Council, and by virtue of bilateral or multilateral agreements, grants on the basis of a first filing made at the European Patent Office as well as on the basis of a first filing made in or for any Contracting State and subject to conditions equivalent to those laid down in the Paris Convention, a right of priority having equivalent effect.