Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874849 | Asymmetric 1:2-chromium complex dyes containing two azo dyes, one containing an acetoacetanilide coupling component | Gerhard Back, Ulrich Schlesinger, Alois Puntener | 1989-10-17 |