Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4964876 | Blue anthraquinone disperse dyes and mixtures of blue disperse dyes | Christian Frey, Konrad Schmid | 1990-10-23 |
| 4825005 | Process for the preparation of aromatic ether and thioether compounds | Christian Frey | 1989-04-25 |
| 4767573 | Process for the preparation of a mixture of 1-amino-2-chloro-4-hydroxyanthraquinone and 1-amino-2-bromo-4-hydroxyanthraquinone | Rolf Muller | 1988-08-30 |
| 4659831 | Process for the preparation of anthraquinone imides | — | 1987-04-21 |