Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5360930 | Direct dyes having a quaternary center with a long aliphatic chain | Alexander Chan | 1994-11-01 |
| 5344463 | Hair dye compositions and methods utilizing 2-substituted-1-naphthol couplers | Alexander Chan, Mu-Ill Lim, Richard DeMarco | 1994-09-06 |
| 5314505 | Aminoan thraquinone dyes having a quaternary center with a long aliphatic chain | Alexander Chan | 1994-05-24 |
| 5298029 | Nitrophenylenediamine dyes having a quaternary center with a long aliphatic chain | Alexander Chan | 1994-03-29 |