Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7709977 | Method and arrangement for controlling a switching connection between the electrical outputs of a fuel cell and an isolated electrical network | Axel Jansen, Josef Sonntag | 2010-05-04 |
| 7477049 | Method for controlling the quality of the coolant for fuel cell systems | Anton Sonntag, Josef Sonntag | 2009-01-13 |
| 6879164 | Method and device for insulation monitoring of a DC network | Gerald Kollenda | 2005-04-12 |
| 6830843 | Method for controlling the quality of the coolant for fuel cell systems | Anton Sonntag, Josef Sonntag | 2004-12-14 |