US Patent Issued to L'Oreal on June 23 for "Process for dyeing keratin materials using a direct dye and an unsaturated heterocyclic salt, and composition comprising same" (French Inventors)

ALEXANDRIA, Va., July 15 -- United States Patent no. 12,661,312, issued on June 23, was assigned to L'Oreal (Paris).

"Process for dyeing keratin materials using a direct dye and an unsaturated heterocyclic salt, and composition comprising same" was invented by Stephane Sabelle (Aulnay-sous-Bois, France) and Olivier Guerard (Aulnay-sous-Bois, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a cosmetic process for treating keratin materials, in particular keratin fibers, preferably human keratin fibers such as the hair, using a) one or more direct dyes and b) one or more particular heterocyclic salts, to a composition comprising ingredients a) and b) and to a kit comprisin...