Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4367810 | Elevator car and door motion interlocks | John C. Doane, Gary K. Roberts | 1983-01-11 |
| 4308935 | Autonomous elevator cab operation | — | 1982-01-05 |
| 4300660 | Elevator door motion reversal | Charles F. Schoenmann | 1981-11-17 |
| 4299308 | Position controlled elevator door motion | Wu-Shi Shung | 1981-11-10 |
| 4299309 | Empty elevator car determination | Joseph Bittar | 1981-11-10 |