Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886516 | Diaminotetrafluoroethoxybenzenes, process for producing same and hair coloring agents containing same | Eugen Konrad | 1989-12-12 |
| 4854935 | 5-alkoxy-2,4-diamino-alkyl-benzenes and hairdye compositions based on 5-alkoxy-2,4-diamino-alkyl-benzenes | Eugen Konrad | 1989-08-08 |
| 4845294 | Diaminotetrafluoroethoxybenzenes | Eugen Konrad | 1989-07-04 |
| 4835314 | 2-nitroaniline derivatives | Eugen Konrad, Hans-Jurgen Braun, Herbert Mager | 1989-05-30 |
| 4797130 | Oxidative hair dye composition based on 4-amino-2-aminomethyl-phenols | Eugen Konrad | 1989-01-10 |