European patent registration - Intervention of the assumed infringer

According to Article 105 of the European Patent Convention (EPC)


Any third party may, in accordance with the EPC Implementing Regulations, intervene in opposition proceedings after the opposition period has expired, if the third party proves that  


proceedings for infringement of the same patent have been instituted against him, or 


following a request of the proprietor of the patent to cease alleged infringement, the third party has instituted proceedings for a ruling that he is not infringing the patent. 


An admissible intervention shall be treated as an opposition. 


Prepared by European Patent Registration and Consulting Services GmbH