Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5270456 | Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series | Erwin Hahn, Guenter Hansen, Karl-Heinz Etzbach, Helmut Reichelt, Ernst Schefczik +1 more | 1993-12-14 |