Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10287435 | Preparation of Pigment Red 149 | Josef Hetzenegger, Andreas Stohr, Hans-Joachim Uschmann | 2019-05-14 |
| 5554774 | Preparation of chlorinated violanthrones or isoviolanthrones | Udo Bergmann, Gerhard Sch afer | 1996-09-10 |
| 4940492 | Colorant mixtures containing isoquinoline derivatives, use thereof in printing inks, and novel isoquinoline derivatives | Johannes P. Dix | 1990-07-10 |
| 4897478 | Preparation of haloisatoic anhydrides | Hartmut Kanter, Burkhard Ort | 1990-01-30 |
| 4861898 | Isoindoline metal complexes | Volker Radtke, Erwin Hahn | 1989-08-29 |
| 4785114 | Quinophthalone dyes | Wolfgang Lotsch, Peter Neumann | 1988-11-15 |
| 4751314 | Preparation of tetrachloro-3-iminoisoindolin-1-one | Erwin Hahn | 1988-06-14 |
| 4563519 | Anthraquinone azopyrazalone colorants | Peter Dimroth | 1986-01-07 |
| 4491544 | Dyes having a diazo component and an isoquinoline coupling component | Volker Radtke, Erwin Hahn, Peter Hauser | 1985-01-01 |