Within nine months of the publication of the mention of the grant of a European patent, any person may give notice to the European Patent Office of opposition to the European patent granted1. The opposition applies to the European patent in all the contracting states in which the patent has effect2. Opposition may be filed on the following grounds only:
(1) that the subject matter of the European patent is not patentable within the meaning of the European Patent Convention3;
(2) that the European patent does not disclose the invention in a manner sufficiently clear and complete for it
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