Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6526368 | Elevator car position sensing system | Steven D. Coste, Jason S. Stone, D. Richard Schafer, Kim Ngoc Trinh, William G. Edgar +1 more | 2003-02-25 |
| 6128116 | Retroreflective elevator hoistway position sensor | August J. Dobler, D. Richard Schafer | 2000-10-03 |
| 5771277 | Elevator car modem with transhybrid rejection | Bertram F. Kupersmith | 1998-06-23 |
| 5153390 | Method for avoiding terminal landing position initialization after power loss | William F. Barkman, Jeremy B. Kezer | 1992-10-06 |
| 4622551 | Half-duplex industrial communications system | Bertram F. Kupersmith, Gary Full, Gregory A. Schienda | 1986-11-11 |