Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5261470 | Wheelchair traction device for snow and ice | Mark A. Kappel, Christopher J. Wieloch, Thomas J. Pokrzywinski | 1993-11-16 |
| 5033993 | Positive, drive conversion kit for motorized wheelchair | Mark A. Kappel, Christopher J. Wieloch, Thomas J. Pokrzywinski | 1991-07-23 |