Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5766576 | Oxidation hair dye compositions containing 3,4,5-triaminopyrazole derivatives and 3,4,5-triaminopyrazole derivatives | Stefan Gerstung, Wolfgang Balzer | 1998-06-16 |
| 5132461 | Process for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitro-be nzene | Thomas Clausen | 1992-07-21 |
| 4900869 | Process for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitroben zene | Thomas Clausen | 1990-02-13 |