US Patent Issued to Wella Operations US on May 26 for "Method and composition for oxidative hair coloring" (American, German Inventors)

ALEXANDRIA, Va., May 26 -- United States Patent no. 12,636,241, issued on May 26, was assigned to Wella Operations US LLC (Calabasas, Calif.).

"Method and composition for oxidative hair coloring" was invented by Firoj Vohra (Hackettstown, N.J.) and Graham Neil Mckelvey (Glashutten, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is directed to embodiments of a method for coloring hair using an oxidative hair coloring composition based upon the primary dye compounds MBB, Aminol and optional secondary precursor and coupler compounds PAP, DPE, MAP, AHT and EOAP, a carbonate and/or bicarbonate source, an alkalizer and one or more amino acids. Additional subsidiary precursors and coup...