Rule 80 – Amendment of the European patent - 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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Without prejudice to Rule 138, the description, claims and drawings may be amended, provided that the amendments are occasioned by a ground for opposition under Article 100, even if that ground has not been invoked by the opponent.