Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6797012 | Solid colorant for keratin fibers | Detlef Hollenberg, Michael Dreja | 2004-09-28 |
| 6790240 | Solid colorant for keratin fibers | Britta Bossmann, Detlef Hollenberg, Michael Dreja | 2004-09-14 |
| 6672143 | Process for determining the degeneration level of keratinic fibers | Claudia Brockmann, Detlef Hollenberg | 2004-01-06 |
| 6673123 | Solid colorant for keratin fibers | Detlef Hollenberg, Michael Dreja | 2004-01-06 |