Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8579532 | Dosing device comprising a monolithic, resilient roll | Elvira Ahrens, Stephan Ahrens | 2013-11-12 |
| 7757900 | Dispenser pump | Roland Knauer, Frank P. Rauch, Stephan Porzelt, Barbara Kösske, Wolfgang Heukamp | 2010-07-20 |
| 5427463 | Ink writing implement | Bernd Bastiansen | 1995-06-27 |
| 5242234 | Drawing pen | — | 1993-09-07 |