Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7101104 | Free ink system | Wolfgang Witz, Ralf Polley | 2006-09-05 |
| 6695517 | Free ink system | Wolfgang Witz, Ralf Polley | 2004-02-24 |
| 6632041 | Free ink system | Wolfgang Witz, Gerold Anderka, Ralf Polley | 2003-10-14 |
| 6322269 | Free ink system | Wolfgang Witz, Gerold Anderka, Ralf Polley | 2001-11-27 |
| 6062758 | Ink writing implement | Petra Maurer | 2000-05-16 |
| 5938362 | Writing implement for ink | — | 1999-08-17 |
| 5427463 | Ink writing implement | Hans-Joachim Ahrens | 1995-06-27 |
| 5420615 | Unitary body plotter pen | Wolfgang Witz | 1995-05-30 |