Issued Patents 2018
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10004674 | Substituted p-phenylenediamines as new oxidation dye precursor products of the developer type | Helmut Giesa, Jan-Michael Schoenebeck | 2018-06-26 |
| 9889321 | Agents for dyeing keratin fibers, containing at least one dimeric, ring-bridged azo dye | Helmut Giesa, Melanie Moch | 2018-02-13 |