Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4684371 | Oxidation hair dyes comprising m-phenylenediamine derivatives as coupling components | Norbert Maak, Edgar Lieske | 1987-08-04 |
| 4463006 | Diglycidyl-pteridine compounds | Hinrich Moller, Brigitte Hase, Hans-Christoph Wilk, Ulrich Zeidler | 1984-07-31 |
| 4322212 | Oxidation hair dyes comprising substituted benzotriazoles | Edgar Lieske | 1982-03-30 |
| 4314809 | Novel coupler components for oxidation hair dyes, the manufacture thereof, and hair colorants | David Rose, Peter Busch, Edgar Lieske | 1982-02-09 |