Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2008-09-23
2011-10-11
Elhilo, Eisa (Department: 1761)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S409000, C008S426000, C008S432000, C008S435000, C008S565000, C008S568000, C008S608000, C008S616000, C008S642000, C132S202000, C132S208000, C562S426000
Reexamination Certificate
active
08034125
ABSTRACT:
The present invention relates to the dyeing of keratin materials using two colorless dye precursors, at least one of which contains a disulfide/thiol unit, said precursors reacting together chemically to form the color in situ. The process according to the invention makes it possible in the context of certain variants to solve the problems caused by the color generated during the process, while at the same time not degrading the efficacy of the coloration, and especially of the lightening effect. The colorations obtained are moreover powerful, chromatic, sparingly selective, and fast with respect to external agents such as sunlight, perspiration and especially shampoo.
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Daubresse Nicolas
Greaves Andrew
Elhilo Eisa
Finnegan Henderson Farabow Garrett & Dunner
L'Oreal S.A.
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