Legal doctrine of the UPC’s Court of Appeal on the patent invalidity defence: is the way in which the ‘long arm’ is applied compatible with the UPC’s own Rules of Procedure?

The Court of Appeal of the Unified Patent Court has ruled that a patent invalidity defence cannot be raised before the Unified Patent Court, with only a counterclaim being possible. This calls into question the way in which the ‘long arm’ is being applied with regard to European patents validated in States that are not party to the Agreement on a Unified Patent Court (UPCA), whether or not they are members of the European Union, since no counterclaim for revocation or plea of invalidity as a defence can be filed or raised with regard to such patents. This raises significant doubts about the compatibility of how the ‘long arm’ is applied in the Unified Patent Court system, given its own Rules of Procedure.

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