Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5690699 | Azo dye mixtures and their use | Klaus Hannemann | 1997-11-25 |
| 5667534 | Dye mixtures comprising 1:2 chromium complex dyes, and 1:2 chromium complex dyes | Marcel Frick | 1997-09-16 |