Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5230710 | Substituted 2,6-diaminotoluenes, processes for their preparation and coloring agents for keratinic fibers comprising these compounds | Mustafa Akram, Wolfgang Schlenther | 1993-07-27 |
| 5163970 | Nitro-p-phenylenediamine derivatives, processes for their preparation and coloring agents containing these for use on keratin fibres | Mustafa Akram | 1992-11-17 |
| 5091581 | Process for the selective preparation of N-substituted 1,4-diamino-2-nitrobenzenes | — | 1992-02-25 |
| 5067967 | Nitro-p-phenylenediamine derivatives, processes for their preparation and coloring agents containing these for use on keratin fibres | Mustafa Akram | 1991-11-26 |
| 4857070 | 2,4-Diaminophenyl tetrahydrofurfuryl ethers, processes for their preparation and tinting compositions, which contain them for keratinic fibres | Horst Tappe | 1989-08-15 |
| 4575378 | Substituted 4-amino-3-nitrophenols, processes for their preparation and hair-coloring agents containing these compounds | Thomas Oelschlager, Wolfgang Schlenther | 1986-03-11 |