Rule 59 – Deficiencies in claiming priority - The European Patent Convention, Implementing Regulations – to the Convention on the Grant of European Patents, Part IV – Implementing Regulations to Part IV of the Convention, Chapter I – Examination by the Receiving Section
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If the file number of the previous application under Rule 52, paragraph 1, or the copy of that application under Rule 53, paragraph 1, have not been filed in due time, the European Patent Office shall inform the applicant accordingly and invite him to file them within a period to be specified.