▁the ▁inter v ener ▁becomes ▁party ▁to ▁the ▁opposition ▁proceed ings . ▁An ▁inter vention ▁may ▁be ▁based ▁on ▁any ▁ground ▁for ▁opposition ▁under ▁Article ▁ 1 0 0 ▁E PC , ▁and ▁the ▁inter v ener ▁may ▁naturally ▁also ▁introduce ▁new ▁facts ▁and ▁arguments , ▁which ▁can ▁therefore ▁not ▁be ▁regarded ▁as ▁late ▁file d . ▁ ▁The ▁possibility ▁to ▁interven e ▁not ▁only ▁exists ▁during ▁pending ▁opposition ▁proceed ings ▁before ▁an ▁O pp osition ▁Division ▁( i . e ., ▁during ▁the ▁first ▁instance ▁proceed ings ), ▁but ▁also ▁during ▁subsequent ▁pending ▁appeal ▁proceed ings ▁before ▁a ▁Board ▁of ▁App e al ▁( i . e ., ▁during ▁the ▁second ▁instance ▁proceed ings ). ▁An ▁inter v ener ▁who ▁interven ed ▁during ▁appeal ▁proceed ings ▁is , ▁however , ▁not ▁treated ▁as ▁app ell ant , ▁but ▁merely ▁as ▁party ▁as ▁of ▁right ▁within ▁the ▁meaning ▁of ▁. ▁This ▁has ▁the ▁consequence ▁that , ▁if ▁the ▁sole ▁app ell ant ▁withdraw s ▁their ▁appeal , ▁the ▁appeal ▁cannot ▁continue ▁with ▁only ▁an ▁inter v ener ▁who ▁interven ed ▁during ▁the ▁appeal . ▁ ▁Observ ations ▁by ▁third ▁parties ▁under ▁Article ▁ 1 1 5 ▁E PC ▁▁ ▁Independ ently ▁from ▁the ▁possibility ▁to ▁interven e ▁in ▁opposition ▁proceed ings ▁( and ▁then ▁to ▁become ▁party ▁to ▁the ▁proceed ings ), ▁anyone ▁may ▁also ▁file ▁observations ▁under ▁. ▁After ▁publication ▁of ▁a ▁European ▁pat ent ▁application , ▁and ▁a ▁fort ior i ▁after ▁grant ▁of ▁a ▁European ▁pat ent , ▁anyone ▁may