If you believe that a European patent has been wrongly granted, you can challenge the validity of the patent using the European Patent Office's Opposition procedure. This can result in a limitation of the scope of the patent or even its complete revocation. Oppositions are filed against about 5–6% of granted European patents.
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Webber, P. Oppositions and Appeals at the EPO. Nat Rev Drug Discov 3, 903 (2004). https://doi.org/10.1038/nrd1556
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DOI: https://doi.org/10.1038/nrd1556
