Issued Patents 1994
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5368610 | Use of metal salts and chelates together with chlorites as oxidants in hair coloring | Gottfried Wenke, Ciuseppe Prota | 1994-11-29 |
| 5360930 | Direct dyes having a quaternary center with a long aliphatic chain | Yuh-Guo Pan | 1994-11-01 |
| 5344463 | Hair dye compositions and methods utilizing 2-substituted-1-naphthol couplers | Yuh-Guo Pan, Mu-Ill Lim, Richard DeMarco | 1994-09-06 |
| 5314505 | Aminoan thraquinone dyes having a quaternary center with a long aliphatic chain | Yuh-Guo Pan | 1994-05-24 |
| 5298029 | Nitrophenylenediamine dyes having a quaternary center with a long aliphatic chain | Yuh-Guo Pan | 1994-03-29 |