US Patent Issued to Henkel on June 30 for "Agent for oxidatively dyeing keratin fibers, containing at least one oxidation dye precursor of the developer type and isatin" (German Inventors)

ALEXANDRIA, Va., July 16 -- United States Patent no. 12,667,531, issued on June 30, was assigned to Henkel AG & Co. KGaA (Dusseldorf, Germany).

"Agent for oxidatively dyeing keratin fibers, containing at least one oxidation dye precursor of the developer type and isatin" was invented by Thomas Hippe (Appen, Germany), Astrid Kleen (Haseldorf, Germany), Hartmut Manneck (Barnitz, Germany), Stefan Hoepfner (Hamburg, Germany) and Tugce Cansev (Hamburg, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an agent for oxidatively dyeing keratin fibers, and in particular human hair, containing, in a cosmetic carrier, (a) at least one oxidation dye precursor of the developer type, ...