Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873372 | Isolation of 4,4'-dichlorodiphenyl sulfone | Gerhard Schaefer, Peter Neumann, Michael Stumpp | 1989-10-10 |
| 4843153 | Azo dyes containing thienothiophene radicals as radicals of the diazo component | Karl-Heinz Etzbach, Guenter Hansen, Helmut Reichelt | 1989-06-27 |