Article 66 – Equivalence of European filing with national filing - The European Patent Convention, Convention on the Grant of European Patents – (European Patent Convention), Part II – Substantive patent law, Chapter III – Effects of the European patent and the European patent application
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A European patent application which has been accorded a date of filing shall, in the designated Contracting States, be equivalent to a regular national filing, where appropriate with the priority claimed for the European patent application.