Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5210190 | Preparation of triazinyl-bis-anthraquinone dyes by reacting aryldihalotriazine with amino anthraquinone | Reinhard Helwig, Helmut Hoch | 1993-05-11 |
| 5180841 | Preparation of 1-amino-2-chloro-4-hydroxyanthraquinone | — | 1993-01-19 |
| 5082957 | Preparation of 1-amino-2-bromo-4-hydroxyanthraquinone | — | 1992-01-21 |
| 4997960 | Preparation of 1-amino-2-chloro-4-hydroxyanthraquinone | — | 1991-03-05 |
| 4925954 | Vat dye based on flouranthene | Manfred Patsch, Helmut Flohr, Helmut Degen, Uwe Nahr | 1990-05-15 |
| 4614804 | Anthraquinoid dyes | Reinhold Krallmann, Wolf-Dieter Kermer, Hans Weber | 1986-09-30 |
| 4294581 | Uniformly dyed water-swellable cellulosic fibers | Siegfried Mensch, Wolfgang Elser | 1981-10-13 |