Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883656 | Composition and method for the oxidative dyeing of hair | Eugen Konrad, Axel Hoffmann | 1989-11-28 |
| 4855130 | Hair treating compositions and processes for improving the condition of hair | Eugen Konrad, Dietrich Hoch | 1989-08-08 |
| 4840639 | Agent for dyeing hair | Hans Husemeyer, Eugen Konrad | 1989-06-20 |
| 4835314 | 2-nitroaniline derivatives | Eugen Konrad, Thomas Clausen, Hans-Jurgen Braun | 1989-05-30 |