Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7377713 | Front-wheel support for a wheel chair | Robertus H. P. F. Schaap, Florian Kaufmann | 2008-05-27 |
| 6311999 | Wheelchair with a closed three-dimensional frame | — | 2001-11-06 |
| 5758897 | Foldable wheelchair | — | 1998-06-02 |
| 4852899 | Lightweight wheelchair adjustable for a specific balance | — | 1989-08-01 |