Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8641070 | Drive assistance device, wheelchair and method for determination of the physical efficiency and muscular effort data of a wheelchair driver | Ralf Ledda, Bernd Engels, Paul-Gerhard Bitzer | 2014-02-04 |
| 7100716 | Modular wheel chair | Bernd Engels, Ralf Ledda, Marc Binder | 2006-09-05 |
| 5717753 | Switching mat for a telephone or radio handset | — | 1998-02-10 |
| D375951 | Face plate for a radiotelephone | — | 1996-11-26 |