Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5788018 | Traction elevators with adjustable traction sheave loading, with or without counterweights | John K. Salmon | 1998-08-04 |
| 4751984 | Dynamically generated adaptive elevator velocity profile | Walter L. Williams, Donald McPherson | 1988-06-21 |
| 4497391 | Modular operational elevator control system | Joe K. Koe, Gregory A. Schienda | 1985-02-05 |
| 4305479 | Variable elevator up peak dispatching interval | Joseph Bittar | 1981-12-15 |