US Patent Issued to KAO on Aug. 12 for "Dyeing method for keratin fibers comprising a direct azo-dye and an organic alkalizing agent, and kit-of-parts thereof" (German Inventors)

ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,383,480, issued on Aug. 12, was assigned to KAO Corp. (Tokyo).

"Dyeing method for keratin fibers comprising a direct azo-dye and an organic alkalizing agent, and kit-of-parts thereof" was invented by Bernd Nocker (Darmstadt, Germany), Steven Breakspear (Darmstadt, Germany), Fariba Ghiasi (Darmstadt, Germany) and Anna Neu (Darmstadt, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for dyeing keratin fibers, including mixing an aqueous dyeing composition containing a dye compound which is an anionic azo dye, a non-ionic azo dye, a salt thereof, or a mixture thereof, and an alkalizing agent having at least one basic functional group whose c...