Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5374302 | Water-insoluble sulphur dyes, their preparation and use | Willi Steckelberg, Josef Ritter, Wilhelm Mauelshagen | 1994-12-20 |
| 5368637 | Water-insoluble sulphur dyes, their preparation and use | Willi Steckelberg, Josef Ritter, Wilhelm Mauelshagen | 1994-11-29 |
| 5347019 | Process for the preparation of 4-(2-aminophenylthio)naphthalic anhydride derivatives | Wassilis Koumbouris | 1994-09-13 |
| 5280128 | Process for the preparation of benzothioxanthene dyestuffs | Eberhard Grimm, Uwe Nickel, Manfred Schrod, Herbert Wille | 1994-01-18 |