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:
Jul. 07, 1998
Filed:
Mar. 10, 1997
Paolo Giacomoni, Enghien-les-Bains, FR;
Laurent Marrot, Livry-Gargan, FR;
Myriam Mellul, l'Hay-les-Roses, FR;
Annick Colette, L'Hay-les-Roses, FR;
L'Oreal, Paris, FR;
Abstract
Process for the preparation of a melanic pigment of small particle size and its use in cosmetics. The subject of the present invention is a process for the preparation of a melanic pigment of very small particle size in which 100% of the particles have a particle size smaller than 1.mu.m, consisting in dissolving a melanin of natural and/or synthetic origin in an aqueous medium containing at least one alkalifying agent and/or at least one sequestering agent, and in precipitating the melanin thus dissolved by addition of at least one alkaline-earth metal salt. Another subject of the invention is the use of this pigment in compositions for cosmetic treatments and for dyeing hair.