Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6551364 | Dye mixtures, 1:2 cobalt complex formazan dyes and their use | Urs Lehmann | 2003-04-22 |
| 6521032 | Magenta inks comprising copper complex azo dyes based on 1-naphthol-di- or tri-sulfonic acids | Urs Lehmann | 2003-02-18 |