ALEXANDRIA, Va., April 15 -- United States Patent no. 12,599,546, issued on April 14, was assigned to L'OREAL (Paris).

"Hair treatment compositions, kits thereof, and methods thereof" was invented by Kazumitsu Kawakami (Westfield, N.J.) and Liliana Xavier (Mountainside, N.J.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Hair treatment compositions, kits thereof, and methods of use thereof that provide enhanced color tone preservation. The hair treatment compositions typically include about 2 to about 10 wt. % of two or more cationic surfactants comprising a di-alkyl dimonium halide compound or salt thereof and a mono-alkyl trimonium halide compound or salt thereof; about 0.1 to about 10 wt. % of a thickenin...