Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5364972 | Preparation of nitrobenzophenones, and a color-stable modification of a benzophenone-azopyridone dye | Helmut Degen, Norbert Zimmerman, Ralf Brueckmann, Arno Lange, Helmut Reichelt | 1994-11-15 |
| 5330543 | Thiopheneazo dyes with a coupling component of the diaminopyridine series | Guenter Hansen, Hermann Loeffler, Helmut Reichelt, Helmut Degen, Arno Lange +1 more | 1994-07-19 |