Rule 15 – Limitation on withdrawals - The European Patent Convention, Implementing Regulations – to the Convention on the Grant of European Patents, Part II – Implementing Regulations to Part II of the Convention, Chapter I – Procedure where the applicant is not entitled
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From the date on which a third party provides evidence that he has instituted national proceedings under Rule 14, paragraph 1, and up to the date on which the proceedings for grant are resumed, neither the European patent application nor the designation of any Contracting State may be withdrawn.