Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8330396 | Starting device with two input poles | Reinhard Schauerte, Tobias Schulte | 2012-12-11 |
| 8080944 | Ignition device | Reinhard Schauerte, Tobias Schulte | 2011-12-20 |
| 6720738 | Method and circuit arrangement for producing an ignition voltage for fluorescent lamps | Ralf Keggenhoff | 2004-04-13 |
| 6525479 | Method and ballast for operating a lamp fitted with a fluorescent tube | Ralf Keggenhoff | 2003-02-25 |
| 5079485 | Ballast for supplying a plurality of discharge lamps | Fred Hasemann, Norbert Wittig | 1992-01-07 |
| 4914355 | D.C. voltage supply circuit for fluorescent lamps | Fred Hasemann, Norbert Wittig | 1990-04-03 |
| 4806843 | D.C. voltage supply circuit | Fred Hasemann, Norbert Wittig | 1989-02-21 |