Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5612465 | Phenylazotriazolopyridine dyestuffs | Ernst Schefczik, Ruediger Sens, Karl-Heinz Etzbach, Helmut Reichelt | 1997-03-18 |
| 5608041 | Azo dyestuffs containing a diazo component from the aniline series and coupling component from the triazolopyridine series | Ernst Schefczik, Volker Bach, Helmut Reichelt | 1997-03-04 |