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:
Aug. 11, 1998
Filed:
Nov. 25, 1996
Alain Lagrange, Coupvray, FR;
Alex Junino, Livry-Gargan, FR;
Alain Genet, Aulnay-sous-Bois, FR;
Jean Cotteret, Verneuil-sur-Seine, FR;
L'Oreal, Paris, FR;
Abstract
A hydroxypropylated 2-nitro-p-phenylenediamine of formula (I), wherein R1 is a C1-4 alkyl, .beta.-hydroxyethyl, .beta.-hydroxypropyl or .gamma.-hydroxypropyl radical; R2 and R3 independently represent a .beta.-hydroxyethyl, .beta.-hydroxypropyl, .gamma.-hydroxypropyl or .beta.,.gamma.-dihydroxypropyl radical, with the proviso that at least one of R1, R2 and R3 is a .gamma.-hydroxypropyl radical, while the other two are not both a .beta.-hydroxyethyl radical; and cosmetically acceptable salts thereof. This compound may be used for directly dyeing hair to give blue through purplish blue shades which are wash-fast, light-fast, waterproof and sweat resistant.