Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 9828211 | Actively damping vertical oscillations of an elevator car | — | 2017-11-28 | |
| 7204347 | Arrhythmic pulse sequence for sonic distance measurement | Peter Herkel | 2007-04-17 | $61,512,000 |
| 6170614 | Electronic overspeed governor for elevators | Peter Herkel | 2001-01-09 | $41,085,000 |
| 6079521 | Measuring elevator position with scanning laser beam | Peter Herkel | 2000-06-27 | $242,424,000 |
| 6037686 | Current compensated choke filter for multi-phase motor drives | Robert Oesterle, Christoph M. Ernecke | 2000-03-14 | $33,615,000 |
| 5883345 | Sonic position measurement system | Stefan Spannhake | 1999-03-16 | $15,156,000 |
| 5841083 | Blocked door detection for an elevator system | Helmut Schroder-Brumloop | 1998-11-24 | $17,738,000 |