Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5431699 | Mixtures of azo dyes for navy to black hues | Arno Lange, Uwe Nahr, Walter P. Sieber | 1995-07-11 |
| 5318601 | Dye mixtures containing azo and quinophthalone dyes | Arno Lange, Gert Motzkus, Helmut Degen | 1994-06-07 |