Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5279652 | Use of solids as antiblocking additives for marker liquids | Rainer Kaufmann | 1994-01-18 |
| 4708506 | Ink supply system with tube pump | — | 1987-11-24 |
| 4634305 | Ink supply system for writing instruments which operate with liquid ink | — | 1987-01-06 |
| 4573819 | System for supplying ink for writing instruments | — | 1986-03-04 |
| 4265726 | Aluminum plating cell | Klaus P. Nussen | 1981-05-05 |
| 4225256 | Pen nib with slit for liquid inks | Jurgen Rosler | 1980-09-30 |