Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5340367 | Permanent waving and color enhancing composition and method | Thomas M. Schultz | 1994-08-23 |
| 5183941 | Hair dye coupler compounds | Yuh-Guo Pan, Alexander Chan | 1993-02-02 |
| 5073173 | Dye couplers | Yuh-Guo Pan, Alexander Chan | 1991-12-17 |
| 5024673 | Nitroaniline dyes with a cyano substituent group | Yuh-Guo Pan | 1991-06-18 |
| 4980158 | Nitroaniline dyes with a cyano substituent group | Yuh-Guo Pan | 1990-12-25 |
| 4980505 | Organic synthesis | Yuh-Guo Pan | 1990-12-25 |