Rule 89 – Intervention of the assumed infringer - The European Patent Convention, Implementing Regulations – to the Convention on the Grant of European Patents, Part V – Implementing Regulations to Part V of the Convention, Chapter I – Opposition procedure
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Notice of intervention shall be filed within three months of the date on which proceedings referred to in Article 105 are instituted.
Notice of intervention shall be filed in a written reasoned statement; Rules 76 and Rule 77 shall apply mutatis mutandis. The notice of intervention shall not be deemed to have been filed until the opposition fee has been paid.