US Patent Issued to Henkel on May 12 for "Agent for oxidative dyeing of keratin fibers, containing isatin and at least one defined polymer" (German Inventors)

ALEXANDRIA, Va., May 12 -- United States Patent no. 12,622,856, issued on May 12, was assigned to Henkel AG & Co. KGaA (Dusseldorf, Germany).

"Agent for oxidative dyeing of keratin fibers, containing isatin and at least one defined polymer" 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: "An agent for oxidatively dyeing keratin fibers, in particular human hair, containing, in a cosmetic carrier, isatin and at least one polymer from the group consisting of xanthan gum, algin, carrageenan, cetyl hydroxyethyl cellulose, carboxym...