ALEXANDRIA, Va., July 14 -- United States Patent no. 12,677,921, issued on July 14, was assigned to L'OREAL (Paris).
"Device for the oxidation dyeing of keratin fibres" was invented by Mladen Milic (St. Ouen, France) and David Seneca (St. Ouen, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a device (1) for dyeing keratin fibres, comprising at least two compartments (2) and (3), the first compartment (2) comprising a first composition (A) comprising oxidation dyes and the second compartment (3) comprising a second composition (B) comprising chemical oxidizing agents. Said device allows easy mixing of the compositions contained in said compartments at the time of use."...