Article 123 89
(1) The conditions under which a European patent application or a European patent may be amended in proceedings before the European Patent Office are laid down in the Implementing Regulations. In any case, an applicant shall be allowed at least one opportunity of amending the description, claims and drawings of his own volition.
(2) A European patent application or a European patent may not be amended in such a way that it contains subject-matter which extends beyond the content of the application as filed.
(3) The claims of the European patent may not be amended during opposition proceedings in such a way as to extend the protection conferred.
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