Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5525743 | Preparation of anthraquinone imide compounds | Udo Bergmann, Heike Kilburg, Reinhold Kohlhaupt, Matthias Niedenbrueck | 1996-06-11 |
| 5342950 | Preparation of quinophthalone derivatives | Gerhard Kilpper | 1994-08-30 |
| 5210190 | Preparation of triazinyl-bis-anthraquinone dyes by reacting aryldihalotriazine with amino anthraquinone | Reinhard Helwig, Gerhard Epple | 1993-05-11 |
| 5066820 | Process for the preparation of 1-amino-2-carboxyanthraquinones | Reinhard Helwig | 1991-11-19 |
| 4979684 | Dispersion, comminution or deagglomeration and classification of solids | Reinhard Polke, Norbert Scholz | 1990-12-25 |
| 4950756 | Preparation of 1-nitroanthraquinone-2-carboxylic acid | Jochem Henkelmann, Thomas-Michael Kahl, Gerhard Kilpper, Walter Maier | 1990-08-21 |
| 4916244 | Preparation of 1-amino-4-hydroxy-2-(6'-hydroxyhexoxy)-anthraquinone | — | 1990-04-10 |
| 4904796 | Preparation of a blue anthraquinonoid disperse dye of 1,4-naphthoquinone-[2,]-phthalimides | Eberhard Michaelis | 1990-02-27 |
| 4882095 | Preparation of alkoxy(iso)violanthrenediones | Reinhard Helwig | 1989-11-21 |
| 4824608 | Preparation of C.I. Vat Blue 16 | Reinhard Helwig | 1989-04-25 |
| 4431824 | Preparation of 4,4',7,7'-tetrachlorothioindigo pigments of high color strength | Heinrich Hiller | 1984-02-14 |
| 4332955 | Preparation of transparent pigmentary forms of 4,4',7,7'-tetrachlorothioindigo | Erwin Hahn, Heinrich Hiller | 1982-06-01 |
| 4323510 | Brown vat dye and its preparation | Heinrich Hiller | 1982-04-06 |
| 4298534 | Preparation of brilliant, transparent pigmentary bromo-isoviolanthrone of high tinctorial strength | Erwin Hahn, Heinrich Hiller | 1981-11-03 |
| 4286094 | Preparation of a pigmentary form of perylene-3,4,9,10-tetracarboxylic acid diimide | Heinrich Hiller | 1981-08-25 |
| 4217455 | Preparation of transparent and easily dispersible perylene-3,4,9,10-tetracarboxylic acid diimide pigments of high tinctorial strength | Heinrich Hiller | 1980-08-12 |
| 4189582 | Process for upgrading the color value of 3,4,9,10-tetracarboxylic acid N,N'-bis-methylimide | Heinrich Hiller | 1980-02-19 |