Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6446690 | Antislipping device | Helmut Kaiser, Thilo Ernst Schaffert, Eugen Liesch | 2002-09-10 |
| 6415838 | Anti-skid device | Helmut Kaiser, Thilo Ernst Schaffert, Eugen Liesch | 2002-07-09 |