A.100 EPC Grounds for opposition

Opposition may only be filed on the grounds that: 
the subject-matter of the European patent is not patentable under Articles 52 to 57;
the European patent does not disclose the invention in a manner sufficiently clear and complete for it to be carried out by a person skilled in the art; 
the subject-matter of the European patent extends beyond the content of the application as filed, or, if the patent was granted on a divisional application or on a new application filed under Article 61, beyond the content of the earlier application as filed.
[ Art. 76 83 101 123 R. 76 80 ]
See decisions/opinions of the Enlarged Board of Appeal G 3/89, G 10/91, G 11/91, G 1/95, G 2/95, G 7/95, G 1/99, G 3/04 (Annex I).

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EPC Articles

EPC Implementing Rules

EPO Guidelines - D Opposition and Limitation/Revocation Procedures

EPO Guidelines - E General Procedural Matters

EPO Guidelines - H Amendments and Corrections

Case Law Book: I Patentability

Case Law Book: II Conditions to be met by an Application

Case Law Book: III Amendments

Case Law Book: IV Divisional Applications

Case Law Book: V Priority

Case Law of the Enlarged Board

General Case Law