The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2008
Filed:
Dec. 15, 2005
Hervé David, la Varenne Saint Hilaire, FR;
Andrew Greaves, Montevrain, FR;
Nicolas Daubresse, la Celles St Cloud, FR;
Hervé David, la Varenne Saint Hilaire, FR;
Andrew Greaves, Montevrain, FR;
Nicolas Daubresse, la Celles St Cloud, FR;
L'Oreal S.A., Paris, FR;
Abstract
The present disclosure relates to symmetrical cationic diazo compounds of formula (I) below, their resonance forms, and also their acid addition salts and their solvates: wherein Wradicals, which are identical, are chosen from a halogen atom, or an —NR-Ph-NRR, —NR-Ph-OR, —O-Ph-ORor —O-Ph-NRRgroup or else an —NRRor —ORgroup with certain provisos;L, a non-cationic linker connecting the two identical azo chromophores, is chosen from a covalent bond; an optionally substituted C-Calkyl radical optionally interrupted by a (hetero)cycle, the alkyl radical being optionally interrupted by at least one heteroatom or group comprising at least one heteroatom or an optionally substituted phenyl radical. The disclosure further relates to dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, and also to a method of coloring keratin fibers that employs this composition, and a device comprising a plurality of compartments.