US Patent Issued to L'Oreal on May 27 for "Photonic structure for dynamic expression of colors and effects" (California Inventor)

ALEXANDRIA, Va., June 17 -- United States Patent no. 12,311,040, issued on May 27, was assigned to L'Oreal (Paris).

"Photonic structure for dynamic expression of colors and effects" was invented by David B. Kosecoff (San Francisco).

According to the abstract* released by the U.S. Patent & Trademark Office: "Photochromic formulations including a core material and a photochromic layer overlying the core material and forming a particle are provided. The photochromic layer may include a plurality of photochromic materials, including a first photo-responsive pigment characterized by reversible diffuse reflectance at a first central wavelength from 490 nm to 520 nm in response to irradiation by photons of a first characteristic wavelength, a se...