Designated contracting states | DE | FR | GB | Examination procedure | 05.12.1987 | Fee for publishing/printing paid | Fees paid | Renewal fee | 18.04.1985 | Renewal fee patent year 03 | 19.04.1986 | Renewal fee patent year 04 | 21.04.1987 | Renewal fee patent year 05 | European patent granted | 02.03.1988 | Opposition procedure | 06.05.1991 | Legal effect of revocation of patent | published on 25.09.1991 |