Issued Patents All Time
Showing 1–25 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6719811 | Oxidation colorants for keratin fibers | Guenther Konrad, Iduna Matzik | 2004-04-13 |
| 5685881 | Aromatic allylaminonitro compounds, hair dye compositions containing aromatic allylaminonitio compounds, and synthetic and natural fiber dyeing process | David Rose, Horst Hoeffkes, Iduna Matzik | 1997-11-11 |
| 5609650 | Dyeing of keratin fibres with indolines using metal salts as catalysts | Georg Knuebel, Horst Hoeffkes, Winifried Neuhaus | 1997-03-11 |
| 5246466 | Oxidation dyes | David Rose, Horst Hoeffkes | 1993-09-21 |
| 5104412 | Hair dyeing compositions | David Rose, Horst Hoeffkes | 1992-04-14 |
| 5089025 | Hair dye compositions and certain 1,2,3,4-tetrahydronitroquinoxalines useful therein | David Rose, Horst Hoeffkes | 1992-02-18 |
| 4994087 | Compounds containing substituted phenylamino and pyridyl groups and hair dyeing preparations using them | Guenther Konrad | 1991-02-19 |
| 4976742 | META-aminophenols useful as oxidation hair dye couplers | David Rose, Norbert Maak | 1990-12-11 |
| 4900325 | Hair-dyeing preparations | David Rose, Norbert Maak, Horst Hoeffkes | 1990-02-13 |
| 4900327 | Preparations containing substantive nitrodiphenylamine derivative hair dyes | David Rose, Norbert Maak | 1990-02-13 |
| 4859206 | Hair dye preparations containing nitrodiphenylamine derivative | David Rose, Horst Hoeffkes, Norbert Maak | 1989-08-22 |
| 4842612 | Aminophenyl alkylenediamines useful in oxidation hair dyes | David Rose, Norbert Maak | 1989-06-27 |
| 4838893 | Oxidation hair dyes comprising substituted dihydroxypyridines as coupling components | David Rose, Norbert Maak | 1989-06-13 |
| 4832697 | Hair dye preparations containing substantive nitrodiphenylamine derivatives | David Rose, Norbert Maak | 1989-05-23 |
| 4828568 | Oxidation hair-dyeing preparations | Guenther Konrad, Hinrich Moeller | 1989-05-09 |
| 4756715 | Hair-dyeing preparations containing substantive nitrodiphenylamine derivatives | David Rose, Norbert Maak | 1988-07-12 |
| 4756716 | Preparations containing substantive nitrodiphenylamine derivative hair dyes | David Rose, Norbert Maak | 1988-07-12 |
| 4745652 | New tetra-aminopyrimidine derivatives and their use in hair-dyeing preparations | David Rose, Norbert Maak | 1988-05-24 |
| 4698066 | Amine oxidation dye hair treating compositions | David Rose, Norbert Maak | 1987-10-06 |
| 4684371 | Oxidation hair dyes comprising m-phenylenediamine derivatives as coupling components | Gunther Konrad, Norbert Maak | 1987-08-04 |
| 4629466 | Oxidation hair dyes comprising bis-(2,4-diaminophenyl)-alkanes as coupling components | David Rose | 1986-12-16 |
| 4619666 | Hair dyes containing amino-nitrobenzoic acid or amino-nitrobenzene sulfonic acids as substantive dyes | David Rose, Norbert Maak | 1986-10-28 |
| 4575377 | Oxidation hair dyes comprising resorcinol derivatives as coupling components | David Rose | 1986-03-11 |
| 4552565 | Hair dyes: diresorcyl sulphide, sulphoxide or sulphone coupling agents | Norbert Maak | 1985-11-12 |
| 4325704 | Hair dyes | Gonther Konrad | 1982-04-20 |