| Date | Description | European Patent Bulletin date, issue number |
|---|---|---|
| 11.06.1993 | Application deemed to be withdrawn | published on 04.08.1993 [1993/31] |
| 31.03.1992 | Publication of search report | published on 20.05.1992 [1992/21] |
| 30.08.1991 | Publication in section I.1 EP Bulletin | published on 16.10.1991 [1991/42] |