Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| H726 | 2,4-bis-aryloxy-m-phenylenediamines and their use as couplers in | Keith C. Brown | 1990-01-02 |
| 4838894 | Hair dye coupler and process for making | Keith C. Brown, Bryan Patrick Murphy | 1989-06-13 |