Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6540793 | Coupler for use in oxidative hair dyeing | Mu-lll Lim, Yuh-Guo Pan | 2003-04-01 |
| 6342079 | Primary intermediate for use in oxidative hair dyeing | Yuh-Guo Pan, Mu-Ill Lim | 2002-01-29 |
| 6228130 | Primary intermediate in oxidative hair dyeing | Mu-Ill Lim, Yuh-Guo Pan, Michael Wong | 2001-05-08 |
| 6200353 | Coupler for use in oxidative hair dyeing | Mu-Ill Lim, Yuh-Guo Pan | 2001-03-13 |
| 6074438 | Hair dyeing compositions containing 2-chloro- and 2,6-dichloro-4-aminophenol and phenylpyrazolones | Mu-Ill Lim, Yuh-Guo Pan | 2000-06-13 |
| 6045590 | Storage stable 2-methyl-1-naphthol couplers | Mu-Ill Lim, Yuh-Guo Pan, John D. O'Donoghue | 2000-04-04 |
| 5980584 | Substituted p-aminophenol, process of preparation and use in dyeing hair | Mu-III Lim, Yuh-Guo Pan, Michael Wong | 1999-11-09 |
| 5891200 | Hair dye compositions containing anthraquinone dyes having a quaternary ammonium side chain and neutral direct dyes | Mu-Ill Lim, Yuo-Guo Pan | 1999-04-06 |
| 5865854 | BIS-(2-4-diaminophenoxy) benzenes and their use as coupling components in oxidative hair coloring compositions and methods | Mu-III Lim, Yuh-Guo Pan | 1999-02-02 |
| 5672180 | Storage stable 2-methyl-1-naphthol couplers | Mu-Ill Lim, Yuh-Guo Pan, John D. O'Donoghue | 1997-09-30 |
| 5670698 | Synthesis of 1-acetoxy-2-methylnaphthalene | Mu-Ill Lim, Yuh-Guo Pan, James S. Anderson | 1997-09-23 |
| 5529583 | Storage stable 2-methyl-1-naphthol couplers | Mu-Ill Lim, Yuh-Guo Pan, John D. O'Donoghue | 1996-06-25 |
| 5520707 | Methods for dyeing hair with anthraquinone hair dyes having a quaternary ammonium side chain | Mu-Ill Lim, Yuo-Guo Pan | 1996-05-28 |
| 5486619 | Method of producing DAI from DOPA, using one reaction vessel | Gottfried Wenke, Yuh-Guo Pan, Mu-Ill Lim | 1996-01-23 |
| 5420362 | Synthesis of 2-methyl-1-naphthol | Mu-Ill Lim, Yuo-Guo Pan, Alexander Chan | 1995-05-30 |