Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5689156 | Circuit arrangement for detecting the amount of deposited electrode material on the wall of a lamp vessel | Gunther Hans Derra, Hanns E. Fischer, Hans G. Ganser | 1997-11-18 |
| 5608294 | High pressure lamp operating circuit with suppression of lamp flicker | Gunther Hans Derra, Hanns E. Fischer, Hans G. Ganser | 1997-03-04 |