Opposition period - Guide for applicants: How to get a European patent, How to get – a European patent, D. The European patent grant procedure, V. Opposition procedure
Opposition period
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Up to nine months after publication of the mention that a European patent has been granted, anyone may give the EPO notice of opposition to the patent, except for the proprietor, who is not allowed to oppose his own patent. 
Notice of opposition is not deemed to have been filed until the opposition fee has been paid. 

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