GL D V 6.2 Distinction between allowable and unallowable amendments

The distinction between allowable amendments to the content of a European patent application and amendments which are at variance with Art. 123(2) or Art. 76(1) is set forth in H‑IV, 2 and C‑IX, 1.4. These guidelines will be applied mutatis mutandis in the course of opposition proceedings to determine whether the subject-matter of the European patent as granted or as amended during the opposition proceedings extends beyond the content of the application as filed.

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EPC Articles

EPO Guidelines - C Procedureal Aspects of Substantive Examination

EPO Guidelines - D Opposition and Limitation/Revocation Procedures

EPO Guidelines - H Amendments and Corrections

own subtype: guidelines