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Chapter I – Opposition procedure

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  1. Home
  2. The European Patent Convention – Contents
  3. Implementing Regulations
  4. Part V
  5. Chapter I
  6. Rule 89
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Rule 89 – Intervention of the assumed infringer

Rule 75 – Surrender or lapse of the patent
Rule 76 – Form and content of the opposition
Rule 77 – Rejection of the opposition as inadmissible
Rule 78 – Procedure where the proprietor of the patent is not entitled
Rule 79 – Preparation of the examination of the opposition
Rule 80 – Amendment of the European patent
Rule 81 – Examination of opposition
Rule 82 – Maintenance of the European patent in amended form
Rule 83 – Request for documents
Rule 84 – Continuation of the opposition proceedings by the European Patent Office of its own motion
Rule 85 – Transfer of the European patent
Rule 86 – Documents in opposition proceedings
Rule 87 – Content and form of the new specification of the European patent
Rule 88 – Costs
Rule 89 – Intervention of the assumed infringer

Rule 89111
Intervention of the assumed infringer

Part V – Implementing Regulations to Part V of the Convention
Chapter I – Opposition procedure

(1) Notice of intervention shall be filed within three months of the date on which proceedings referred to in Article 105 are instituted.

(2) 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.


111See decisions of the Enlarged Board of Appeal G 4/91, G 1/94, G 2/04, G 3/04, G 1/05 (Annex I).

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EPC - Reference
  • Art. 99
    R. 3, 6, 76-86, 112
Cross-reference list
  • EPC EPC 1973
    R. 89Art. 105
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