Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6500247 | Black-dyeing inks and their use | Althanassios Tzikas, Marcel Frick | 2002-12-31 |
| 6428582 | Dye mixtures, 1:2 cobalt complex formazan dyes and their use | Marcel Frick | 2002-08-06 |