Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6589295 | Coupler for use in oxidative hair dyeing | Yuh-Guo Pan, Margaret Popp | 2003-07-08 |
| 6562080 | Primary intermediates for oxidative coloration of hair | Yuh-Guo Pan | 2003-05-13 |