5.
Intervention of the assumed infringer 

Under certain conditions (see D‑VII, 6) any third party who proves that proceedings for infringement of the opposed patent have been instituted against him or that the patent proprietor of the patent has requested him to cease alleged infringement of the patent and that he has instituted proceedings for a court ruling that he is not infringing the patent may, after the opposition period has expired, intervene in the opposition proceedings. OnceIf the notice of intervention has beenis filed in good time and in due form, the intervention is to be treated as an opposition (see D‑IV, 5.6). For accelerated processing of oppositions on request, see E‑VII, 4.

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