Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5279313 | Two component composition and method for bleaching hair | Thomas Clausen | 1994-01-18 |
| 5246019 | Process for bleaching hair under the influence of light | Robin E. Godfrey, Thomas Clausen | 1993-09-21 |
| 5224965 | Composition for the oxidative dyeing of hair and new 5-halogen-2,4-diamino alkylbenzenes | Thomas Clausen, Alexa Weinges | 1993-07-06 |
| 4997451 | Oxidative hair dyeing compositions based on 4-aminophenol derivatives and new 4-aminophenol derivatives | Thomas Clausen, Anke Flohr | 1991-03-05 |
| 4975093 | Hair dyeing compositions containing 2,6-dinitro-phenol-derivatives | Thomas Clausen, Gunther Lang | 1990-12-04 |