R.80 EPC Amendment of the European patent

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.
[ Art. 101 105 123 R. 89 137 ]
See decision of the Enlarged Board of Appeal G 1/99 (Annex I).

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