Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888524 | Circuit for operating gas discharge lamps with a periodically alternating lamp current | Ralf Schafer, Hans Peter Stormberg | 1989-12-19 |
| 4839560 | Heatable electrode for high-pressure gas discharge lamps | Ralf Schafer, Hans Peter Stormberg | 1989-06-13 |
| 4816721 | Circuit arrangement for operating a high-pressure gas discharge lamp | Ralf Schafer, Hans Peter Stormberg | 1989-03-28 |