▁universal ▁succession , ▁such ▁as ▁for ▁example ▁in ▁the ▁case ▁of ▁a ▁mer ger ▁of ▁two ▁companies . ▁ ▁Inter vention ▁and ▁observations ▁by ▁third ▁parties ▁ ▁Inter vention ▁under ▁Article ▁ 1 0 5 ▁E PC ▁ ▁Under ▁, ▁any ▁third ▁party ▁may ▁interven e ▁in ▁on going ▁opposition ▁proceed ings ▁after ▁the ▁ 9 - month ▁opposition ▁period ▁has ▁exp ired , ▁if ▁the ▁third ▁party ▁proves ▁that ▁"( a ) ▁proceed ings ▁for ▁in fr ing ement ▁of ▁the ▁same ▁pat ent ▁have ▁been ▁instit uted ▁against ▁him , ▁or ▁( b ) ▁following ▁a ▁request ▁of ▁the ▁propriet or ▁of ▁the ▁pat ent ▁to ▁ce ase ▁alleg ed ▁in fr ing ement , ▁the ▁third ▁party ▁has ▁instit uted ▁proceed ings ▁for ▁a ▁r uling ▁that ▁he ▁is ▁not ▁in fr ing ing ▁the ▁pat ent ." ▁In ▁other ▁words , ▁a ▁third ▁party ▁may ▁interven e ▁" if ▁faced ▁with ▁an ▁in fr ing ement ▁action ▁or ▁alleg ation ▁of ▁in fr ing ement ▁( ...) ▁instit uted ▁in ▁a ▁national ▁juris diction ▁under ▁national ▁law ." ▁ ▁The ▁adm iss ibility ▁of ▁an ▁inter vention ▁is ▁subject ▁to ▁conditions . ▁The ▁so - called ▁notice ▁of ▁inter vention ▁must ▁not ably ▁be ▁file d ▁within ▁three ▁months ▁of ▁the ▁date ▁on ▁which ▁proceed ings ▁referred ▁to ▁in ▁Article ▁ 1 0 5 ▁are ▁instit uted . ▁An ▁adm iss ible ▁inter vention ▁is ▁treated ▁as ▁an ▁opposition . ▁If ▁the ▁inter vention ▁is ▁adm iss ible ,