Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4930604 | Elevator diagnostic monitoring apparatus | Mark Mayfield | 1990-06-05 |
| 4750591 | Elevator car door and motion sequence monitoring apparatus and method | Steven D. Coste | 1988-06-14 |
| 4622551 | Half-duplex industrial communications system | Bertram F. Kupersmith, Julian H. Shull, Gary Full | 1986-11-11 |
| 4497391 | Modular operational elevator control system | Arnold Mendelsohn, Joe K. Koe | 1985-02-05 |