Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6657403 | Circuit arrangement for operating a fluorescent lamp | Michael Weirich | 2003-12-02 |
| 6555970 | Ballast for gas discharge lamps with shutdown of the filament heating | Michael Weirich | 2003-04-29 |