Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888524 | Circuit for operating gas discharge lamps with a periodically alternating lamp current | Hans G. Ganser, Ralf Schafer | 1989-12-19 |
| 4870317 | High-pressure discharge lamp having a thermal insulating member | Horst Dannert | 1989-09-26 |
| 4860269 | Electrochemical time switching device | Detlev Hennings, Manfred Peterek | 1989-08-22 |
| 4839560 | Heatable electrode for high-pressure gas discharge lamps | Hans G. Ganser, Ralf Schafer | 1989-06-13 |
| 4816721 | Circuit arrangement for operating a high-pressure gas discharge lamp | Hans G. Ganser, Ralf Schafer | 1989-03-28 |
| 4812736 | Circuit arrangement for operating high-pressure gas discharge lamps | Manfred Albach, Ralf Schafer, Armin Wegener | 1989-03-14 |