Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6024768 | Diaminoalkane and oxidation colorants | Astrid Kleen | 2000-02-15 |
| 5990355 | Substituted diaminophenols, process for their preparation, and hair dyes containing such compounds | Mustafa Akram, Wolfgang Wolff, Uwe Kobs | 1999-11-23 |
| 5961668 | 4-(2,4-diaminophenoxymethyl)-1,3-dioxolane secondary intermediates, processes for their production, and hair colorants | Mustafa Akram, Wolfgang Bauer, Astrid Kleen | 1999-10-05 |
| 5676706 | Substituted diaminophenols, and hair dyes containing such compounds | Mustafa Akram, Wolfgang Wolff, Uwe Kobs | 1997-10-14 |
| 5508467 | Process for the preparation of hydroxyalkylaminonitrobenzene derivatives | Wolfgang Bauer, Klaus Delpy | 1996-04-16 |