Issued Patents All Time
Showing 26–45 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4900325 | Hair-dyeing preparations | Edgar Lieske, Norbert Maak, Horst Hoeffkes | 1990-02-13 |
| 4900327 | Preparations containing substantive nitrodiphenylamine derivative hair dyes | Edgar Lieske, Norbert Maak | 1990-02-13 |
| 4859206 | Hair dye preparations containing nitrodiphenylamine derivative | Edgar Lieske, Horst Hoeffkes, Norbert Maak | 1989-08-22 |
| 4842612 | Aminophenyl alkylenediamines useful in oxidation hair dyes | Edgar Lieske, Norbert Maak | 1989-06-27 |
| 4838893 | Oxidation hair dyes comprising substituted dihydroxypyridines as coupling components | Norbert Maak, Edgar Lieske | 1989-06-13 |
| 4832697 | Hair dye preparations containing substantive nitrodiphenylamine derivatives | Edgar Lieske, Norbert Maak | 1989-05-23 |
| 4756715 | Hair-dyeing preparations containing substantive nitrodiphenylamine derivatives | Edgar Lieske, Norbert Maak | 1988-07-12 |
| 4756716 | Preparations containing substantive nitrodiphenylamine derivative hair dyes | Edgar Lieske, Norbert Maak | 1988-07-12 |
| 4745652 | New tetra-aminopyrimidine derivatives and their use in hair-dyeing preparations | Edgar Lieske, Norbert Maak | 1988-05-24 |
| 4698066 | Amine oxidation dye hair treating compositions | Norbert Maak, Edgar Lieske | 1987-10-06 |
| 4629466 | Oxidation hair dyes comprising bis-(2,4-diaminophenyl)-alkanes as coupling components | Edgar Lieske | 1986-12-16 |
| 4619666 | Hair dyes containing amino-nitrobenzoic acid or amino-nitrobenzene sulfonic acids as substantive dyes | Edgar Lieske, Norbert Maak | 1986-10-28 |
| 4575377 | Oxidation hair dyes comprising resorcinol derivatives as coupling components | Edgar Lieske | 1986-03-11 |
| 4487607 | Oxidation hair dyes containing 5-halo-2,3-pyridine-diols as coupler components | Norbert Maak | 1984-12-11 |
| 4402699 | Coupler components for the oxidation of hair dyes and their use, as well as hair dyeing agents containing them | Norbert Maak | 1983-09-06 |
| 4371370 | Oxidation hair dyes comprising bis-(2,4-diaminophenoxy)-alkanols as coupling components | Hinrich Moller, Norbert Maak | 1983-02-01 |
| 4314809 | Novel coupler components for oxidation hair dyes, the manufacture thereof, and hair colorants | Peter Busch, Edgar Lieske, Gunther Konrad | 1982-02-09 |
| 4226595 | Oxidation hair-coloring preparation based upon N,N-bis-(.beta.-hydroxyethyl)-m-phenylenediamines | Edgar Lieske, Peter Busch | 1980-10-07 |
| 4213758 | Oxidation hair dyes based upon tetraaminopyrimidine developers and couplers therefor | Erwin Weinrich, Edgar Lieske | 1980-07-22 |
| RE30199 | Oxidation hair dyes based upon tetraaminopyrimidine developers | Ferdi Saygin, Erwin Weinrich | 1980-01-29 |