Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6572665 | Coupler for use in oxidative hair dyeing | Yuh-Guo Pan, Margaret Popp | 2003-06-03 |
| 6521761 | Primary intermediates for oxidative coloration of hair | Yuh-Guo Pan | 2003-02-18 |