Under R. 89 in conjunction with R. 76 EPC, the notice of intervention must give the grounds for the intervention, and the facts and evidence submitted to substantiate them.

CLR III P 1.6 Fees

Under Art. 105(2) EPC in conjunction with Art. 2(1) No. 10 RFees, interveners must pay the opposition fee (see R. 89(2), second sentence, EPC; T 27/92 of 25 July 1994 date: 1994-07-25).

CLR III P 1.5 Time limit for intervention

Under R. 89 EPC, intervention is not possible until the opposition period has expired (this was previously laid down in Art. 105 EPC 1973), but notice of it must be filed within three months of the date on which proceedings referred to in Art. 105 EPC were instituted.