Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5313026 | Electronic stepper to determine elevator car position, with automatic error correction and immunity from power failure | Monique M. LaRose, William P. Reid, Burton Greenfield | 1994-05-17 |
| 5039832 | Touch button light ring system | Richard Polacek, Steven B. Davis | 1991-08-13 |
| 5036321 | Capacitive sensing, solid state touch button system | Robert Bryan Leach, Chester J. Slabinski | 1991-07-30 |
| D318632 | Call button indicator and wall plate for elevators | Richard Polacek | 1991-07-30 |
| 4847728 | Detecting a defective suppressor diode in a coil driving circuit | — | 1989-07-11 |