Opposition may only be filed on the grounds that:
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.
Date retrieved: 30 December 2018
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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
XCLR II E 1.5.2.A Decisions of the Enlarged Board of Appeal on disclaimers in G 1/03, G 2/03 and G 2/10
XCLR II E 3.3 to the claim of an undisclosed feature limiting protection conferred, without providing a technical contribution
XCLR II E 4.2.3 evident that nothing else would have been intended than what is offered as the correction
XCLR II E 4.3 of errors in the description, claims and drawings after grant, and in opposition proceedings