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Guide for applicants, Part 1: How to get a European patent

 
 
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.  
OJ 1994, 891
Notice of opposition is not deemed to have been filed until the opposition fee has been paid.