Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5578711 | Process for the preparation of dyestuffs | Roderich Raue, Karl-Heinrich Lange | 1996-11-26 |
| 5541299 | Process for the preparation of dyestuffs | Roderich Raue, Karl-Heinrich Lange | 1996-07-30 |
| 5502171 | Process for the preparation of dyestuffs | Roderich Raue, Karl-Heinrich Lange | 1996-03-26 |
| 5328993 | Cationic triazatrimethine dyestuffs | Hauke Furstenwerth, Karl-Heinrich Lange, Roderich Raue | 1994-07-12 |
| 4968797 | Chromogenic 4,4-diaryldihydroquinazolones | Horst Berneth, Karlheinrich Meisel | 1990-11-06 |
| 4840641 | Cationic diazacyanine dyestuffs for dyeing polyacrylonitrile-wool blends | — | 1989-06-20 |
| 4754034 | Chromogenic 4,4-diaryldihydroquinazolones | Horst Berneth, Karlheinrich Meisel | 1988-06-28 |
| 4695633 | Chromogenic 4,4-diaryl-dihydroquinazolones, their preparation and their use | Horst Berneth | 1987-09-22 |
| 4446326 | Cationic naphtholactam dyestuffs | — | 1984-05-01 |
| 4396768 | Process for the preparation of anionic quinophthalone dyestuffs | — | 1983-08-02 |
| 4310664 | Process for the preparation of pyridine-4-aldehyde phenylhydrazones | Heinz Giesecke | 1982-01-12 |
| 4283540 | Process for the preparation of cationic naphtholactam dyestuffs | — | 1981-08-11 |
| 4234488 | Benz-[c,d]-indolyl compounds | Horst Harnisch | 1980-11-18 |
| 4220780 | Cationic dyestuffs | — | 1980-09-02 |
| 4203722 | Transfer printing process with naphtholactam dyes | Hans-Peter Kuhlthau | 1980-05-20 |