Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5325036 | Elevator speed sensorless variable voltage variable frequency induction motor drive | Andreas J. Diethert | 1994-06-28 |
| 5306882 | Measuring elevator hoistway position using audible signals | Axel Steffen Gerwing, Lutz Vietze | 1994-04-26 |
| 5223680 | Measuring elevator car position using ultrasound | Klaus Disterer, Rolf E. Hanitsch | 1993-06-29 |