US Patent Issued to L'Oreal on Jan. 27 for "Method for dyeing keratin fibres starting from isatin and from powder and/or dye extract of indigo-producing plants" (French Inventor)

ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,533,311, issued on Jan. 27, was assigned to L'Oreal (Paris).

"Method for dyeing keratin fibres starting from isatin and from powder and/or dye extract of indigo-producing plants" was invented by Boris Lalleman (Saint-Ouen, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "Method for dyeing keratin fibres starting from isatin and from powder and/or dye extract of indigo-producing plants A subject-matter of the present invention is a method for dyeing keratin fibres, comprising the application, to the hair, of isatin and of at least one powder and/or one extract of indigo-producing plant(s)."

The patent was filed on Oct. 7, 2022, under Application No...