Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5816368 | Elevator cars switch hoistways while traveling vertically | David W. Barrett, John F. Cassidy, Jr., George A. L. David, Ernest P. Gagnon, Richard E. Peruggi | 1998-10-06 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5816368 | Elevator cars switch hoistways while traveling vertically | David W. Barrett, John F. Cassidy, Jr., George A. L. David, Ernest P. Gagnon, Richard E. Peruggi | 1998-10-06 |