Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8378590 | Method for detection of non-zero-voltage switching operation of a ballast of fluorescent lamps, and ballast | Martin Feldtkeller, Michael Herfurth | 2013-02-19 |
| 8022637 | Method for detection of non-zero-voltage switching operation of a ballast of fluorescent lamps, and ballast | Martin Feldtkeller, Michael Herfurth | 2011-09-20 |
| 7894218 | Switch-mode converter | Martin Feldtkeller | 2011-02-22 |
| 7834552 | Controlling a lamp ballast | Martin Feldtkeller, Michael Herfurth | 2010-11-16 |
| 7560873 | Method for detection of non-zero-voltage switching operation of a ballast of fluorescent lamps, and ballast | Martin Feldtkeller, Michael Herfurth | 2009-07-14 |
| 7378807 | Drive circuit for a fluorescent lamp with a diagnosis circuit, and method for diagnosis of a fluorescent lamp | Martin Feldtkeller, Michael Herfurth | 2008-05-27 |