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Guidelines for Examination

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 should be applied mutatis mutandis in the course of opposition proceedings in cases where 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.