Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5654122 | N-aminopyridone dyes | Karl-Heinz Etzbach, Ernst Schefczik, Ruediger Sens | 1997-08-05 |
| 5621107 | Sulfopyridones and a process of making therefor | Gunther Lamm, Helmut Reichelt | 1997-04-15 |