Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855412 | Diaminopyridine azo dyes having acyloxy radicals substituted on the diaminopyridine | Johannes Dehnert, Hermann Loeffler | 1989-08-08 |
| 4855413 | Heterocyclic azo dyes containing cyanothiophene derivatives as diazo components and diaminopyridines as coupling components | Johannes Dehnert, Hermann Loeffler | 1989-08-08 |