Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8012220 | Specific monocationic monochromophoric compounds of hydrazone type comprising a 2-, 4-pyridinium or 2-, 4-quinolinium unit, synthesis thereof, dye compositions containing them, and method for dyeing keratin fibres | Hervé David, Andrew Greaves | 2011-09-06 |
| 7569079 | Polycationic monochromophoric hydrazone compounds, dye compositions comprising such polycationic compounds and dyeing process using them | Hervé David | 2009-08-04 |