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:
Nov. 04, 1997
Filed:
Jun. 05, 1995
Jean Cotteret, Verneuil-sur-Seine, FR;
Marie Pascale Audousset, Levallois-Perret, FR;
L'Oreal, Paris, FR;
Abstract
Method for dyeing keratinous fibres, in particular human keratinous fibres such as hair, characterized in that a composition containing, in a medium appropriate for dyeing, at least one 4-hydroxyindole derivative of formula: ##STR1## in which R.sub.1 denotes hydrogen or C.sub.1 -C.sub.4 alkyl; R.sub.2 and R.sub.3, which may be identical or different, denote hydrogen, C.sub.1 -C.sub.4 alkyl, carboxyl or alkoxycarbonyl; and X denotes hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.18 alkoxy, halogen or acetyl-amino; at least one of the groups X, R.sub.1, R.sub.2 and R.sub.3 being other than hydrogen; as well as the salts of these compounds;