Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6062809 | Lift for physically-challenged passengers and method of operation | Rex A. Berkey, Daniel DeFant, Jeffrey A. Hansen, Edward L. Hopper, Philip Alan Johnson +2 more | 2000-05-16 |
| 5595470 | Lift for physically-challenged passengers and method of operation | Rex A. Berkey, Daniel DeFant, Jeffrey A. Hansen, Edward L. Hopper, Philip Alan Johnson +2 more | 1997-01-21 |