Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4322212 | Oxidation hair dyes comprising substituted benzotriazoles | Gunther Konrad | 1982-03-30 |
| 4314809 | Novel coupler components for oxidation hair dyes, the manufacture thereof, and hair colorants | David Rose, Peter Busch, Gunther Konrad | 1982-02-09 |
| 4226595 | Oxidation hair-coloring preparation based upon N,N-bis-(.beta.-hydroxyethyl)-m-phenylenediamines | David Rose, Peter Busch | 1980-10-07 |
| 4226852 | Two-component peroxide hair bleaching compositions | Holger Tesmann, Erwin Weinrich | 1980-10-07 |
| 4213758 | Oxidation hair dyes based upon tetraaminopyrimidine developers and couplers therefor | David Rose, Erwin Weinrich | 1980-07-22 |
| 4186186 | Guanidine accelerators for peroxide hair bleaching compositions | Holger Tesmann, Erwin Weinrich | 1980-01-29 |