| Date | Description | European Patent Bulletin date, issue number |
|---|---|---|
| 06.11.2009 | Change - representative | published on 09.12.2009 [2009/50] |
| 20.08.1992 | No opposition filed within time limit | published on 07.10.1992 [1992/41] |
| 30.08.1991 | (Expected) grant | published on 16.10.1991 [1991/42] |
| 11.10.1990 | First examination report | |
| 24.05.1989 | Request for examination filed | published on 12.07.1989 [1989/28] |
| 04.03.1989 | Publication in section I.1 EP Bulletin | published on 19.04.1989 [1989/16] |