Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5079485 | Ballast for supplying a plurality of discharge lamps | Ferdinand Mertens, Norbert Wittig | 1992-01-07 |
| 4914355 | D.C. voltage supply circuit for fluorescent lamps | Ferdinand Mertens, Norbert Wittig | 1990-04-03 |
| 4806843 | D.C. voltage supply circuit | Ferdinand Mertens, Norbert Wittig | 1989-02-21 |
| 4621309 | Elongated luminaire | Franz-Eugen Grawe, Manfred Grimm, Richard Schneppendahl | 1986-11-04 |