Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4367810 | Elevator car and door motion interlocks | John C. Doane, Gary K. Roberts | 1983-01-11 | $18,065,000 |
| 4308935 | Autonomous elevator cab operation | — | 1982-01-05 | $5,701,000 |
| 4300660 | Elevator door motion reversal | Charles F. Schoenmann | 1981-11-17 | $1,065,000 |
| 4299308 | Position controlled elevator door motion | Wu-Shi Shung | 1981-11-10 | $2,685,000 |
| 4299309 | Empty elevator car determination | Joseph Bittar | 1981-11-10 | $2,685,000 |