Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6424057 | Uninterruptible power supply (UPS) system with primary air cooling | Hilmar Darrelmann, Norbert Ueffing | 2002-07-23 |
| 6023152 | System for stabilizing a power supply system | Hilmar Darrelmann, Klaus Sachs, Uwe Schrader-Hausmann | 2000-02-08 |