Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5874582 | Bulk dyeing using quinophthalone dyestuffs | Stephan Michaelis, Peter Roschger | 1999-02-23 |
| 5800573 | Bulk dyeing using quinophthalone dyestuffs | Stephan Michaelis, Peter Roschger | 1998-09-01 |
| 5621027 | Dyestuffs for bulk dyeing plastics | Peter Roschger, Stephan Michaelis, Friedrich W. Krock | 1997-04-15 |
| 5530130 | Phthaloperinone dyestuffs | Peter Roschger, Stephan Michaelis | 1996-06-25 |
| 4564680 | Isoindolazines | Meinhard Rolf, Rutger Neeff, Walter Muller | 1986-01-14 |
| 4424160 | Process for the preparation of 1-hydroxy-4-amino-5(8)-nitroanthraquinone | Gu/ nter Gehrke | 1984-01-03 |
| 4391606 | Azo polyether dyestuffs, formulations of these dyestuffs, their preparation and their use | Winfried Kruckenberg, Karl H. Schundehutte | 1983-07-05 |
| 4255151 | Process for dyeing and printing cellulose fibres | Gunter Gehrke, Robert Kuth, Werner Kuhnel | 1981-03-10 |
| 4222947 | Anthrachinone dyestuffs | Winfried Kruckenberg, Karl H. Schundehutte | 1980-09-16 |