Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5623060 | Dye mixture containing at least four diazo dyes having the same color with a diaminopyridine coupling component | Hermann Loeffler, Helmut Reichelt | 1997-04-22 |
| 5621107 | Sulfopyridones and a process of making therefor | Helmut Reichelt, Matthias Wiesenfeldt | 1997-04-15 |