US Patent Issued to L'Oreal on March 31 for "Composition comprising a combination of two particular oxidation dye precursors, an amphoteric or zwitterionic surfactant and a solid fatty substance" (French Inventors)

ALEXANDRIA, Va., March 31 -- United States Patent no. 12,589,063, issued on March 31, was assigned to L'Oreal (Paris).

"Composition comprising a combination of two particular oxidation dye precursors, an amphoteric or zwitterionic surfactant and a solid fatty substance" was invented by Anne Sabbagh (Saint-Ouen, France) and Valerie Nicou (Saint-Ouen, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a composition comprising at least one oxidation dyeing base chosen from 2-Gamma-hydroxypropyl-para-phenylenediamine of formula (I), an addition salt thereof, solvates thereof and/or solvates of the salts thereof, at least one oxidation dyeing coupler chosen from (i) 2-amino-4-hydroxyet...