Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8239091 | Method for detecting a “rotating stall” fault in a compressor fed by an inverter | Axel Mertens | 2012-08-07 |
| 8070456 | Method for preventing power surge in a compressor supplied by a power converter by direct torque control | Axel Mertens | 2011-12-06 |
| 5050059 | Frequency changer having parallel partial frequency changers with a DC circuit | Jens Hamann | 1991-09-17 |