| Date | Description | European Patent Bulletin date, issue number |
|---|---|---|
| 07.02.1986 | No opposition filed within time limit | published on 26.03.1986 [1986/13] |
| 01.02.1985 | (Expected) grant | published on 03.04.1985 [1985/14] |
| 14.01.1982 | Publication of search report | published on 17.03.1982 [1982/11] |
| 08.09.1981 | Request for examination filed | published on 11.11.1981 [1981/45] |
| 08.11.1980 | Publication in section I.1 EP Bulletin | published on 07.01.1981 [1981/01] |