Issued Patents All Time
Showing 26–33 of 33 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5183941 | Hair dye coupler compounds | Yuh-Guo Pan, Lana Hochman | 1993-02-02 |
| 5169403 | Direct dyes having a quaternary center with a long aliphatic chain | Yuh-Guo Pan | 1992-12-08 |
| 5135543 | Quaternized monoalkylenediamine nitrobenzene compounds and their use as dyes for keratinaceous fibers | Yuh-Guo Pan | 1992-08-04 |
| 5073173 | Dye couplers | Yuh-Guo Pan, Lana Hochman | 1991-12-17 |
| 5049381 | Skin coloring compositions containing indoles and quaternary ammonium salts | Thomas M. Schultz, George P. Serban | 1991-09-17 |
| 5037640 | Skin coloring and sunscreening compositions containing indoles and M-nitro alkoxybenzenes | Thomas M. Schultz, George P. Serban | 1991-08-06 |
| 4975092 | Processes for coloring and/or conditioning hair | Yuh-Guo Pan, Leszek J. Wolfram | 1990-12-04 |
| 4968497 | Skin tanning composition and method | Leszek J. Wolfram, Thomas M. Schultz, Bryan Patrick Murphy | 1990-11-06 |