Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5316432 | Wheelchair lifts with automatic barrier | John C. Hall, Ryan J. Clouse, P. Fred Risner, Edward L. Strohm | 1994-05-31 |
| 4718812 | Wheelchair lift with positive automatic handrail | Melvin G. Risner | 1988-01-12 |
| 4606433 | Step convertible platform lift | Melvin G. Risner, William D. Sherman | 1986-08-19 |
| 4474527 | Optional manual gravity wheelchair lift | Melvin G. Risner, William D. Sherman | 1984-10-02 |
| 4392771 | Lift safety switch system | — | 1983-07-12 |