Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5690696 | Combinations of two para-phenylenediamine oxidation bases and a meta-phenylenediamine coupler for the oxidation dyeing of keratinous fibers | Roland De La Mettrie | 1997-11-25 |