Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4821166 | Power-supply circuit | — | 1989-04-11 |
| 4812736 | Circuit arrangement for operating high-pressure gas discharge lamps | Ralf Schafer, Hans Peter Stormberg, Armin Wegener | 1989-03-14 |