Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6818023 | Colorants | Horst Hoeffkes, Klaus Schumann | 2004-11-16 |
| 6620408 | Bleaching composition | Horst Hoeffkes | 2003-09-16 |
| 6537330 | Colorants | Horst Hoeffkes, Klaus Schumann | 2003-03-25 |
| 5651793 | Hydrogen peroxide preparations containing foam regulators | Horst Hoeffkes, Karin Nelles | 1997-07-29 |
| 5609650 | Dyeing of keratin fibres with indolines using metal salts as catalysts | Georg Knuebel, Horst Hoeffkes, Edgar Lieske | 1997-03-11 |
| 4927627 | Emulsion-form hydrogen peroxide preparations for the bleaching and oxidative dyeing of hair | Dieter Schrader | 1990-05-22 |