According to Rule 80 of the European Patent Convention (EPC) Implementing Regulations (IR), without prejudice to Rule 138 , of the EPC IR (regulating different claims, description and drawings for different States) the description, claims and drawings in one European patent application may be amended, provided that the amendments are occasioned by a ground for opposition under Article 100 of the EPC , even if that ground has not been invoked by the opponent.
The Opposition may only be filed on the grounds that:
(a)