Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7954606 | Elevator system control responsive to hoistway access detection | Anthony Black, Nora E. LaFreniere | 2011-06-07 |
| 6603398 | Hoistway access detection system | Frank W. Adams | 2003-08-05 |
| 6345695 | Elevator system with counter-rotating drive sheaves | Richard N. Fargo | 2002-02-12 |
| 6325177 | Elevator machine with counter-rotating rotors | Richard N. Fargo | 2001-12-04 |