| Date | Description | European Patent Bulletin date, issue number |
|---|---|---|
| 24.11.1989 | No opposition filed within time limit | published on 10.01.1990 [1990/02] |
| 03.12.1988 | (Expected) grant | published on 18.01.1989 [1989/03] |
| 30.11.1988 | Change - representative | published on 18.01.1989 [1989/03] |
| 21.06.1988 | Change - designated states | published on 10.08.1988 [1988/32] |
| 06.08.1987 | First examination report | |
| 27.09.1986 | Change - applicant | published on 12.11.1986 [1986/46] |
| 27.09.1986 | Change - representative | published on 12.11.1986 [1986/46] |
| 16.07.1985 | Publication of search report | published on 18.09.1985 [1985/38] |
| 28.11.1984 | Request for examination filed | published on 30.01.1985 [1985/05] |
| 16.09.1983 | Publication in section I.1 EP Bulletin | published on 16.11.1983 [1983/46] |