US Patent Issued to HRL Laboratories on Sept. 15 for "Rapid-darkening, wavelength-tunable photochromic compositions, systems, and methods" (California Inventors)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,628, issued on Sept. 15, was assigned to HRL Laboratories LLC (Malibu, Calif.).

"Rapid-darkening, wavelength-tunable photochromic compositions, systems, and methods" was invented by Adam Gross (Santa Monica, Calif.), Erik Crenshaw (Los Angeles), Shirell Klein (Los Angeles) and Gregory Rutkowski (Calabasas, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Rapid-darkening and wavelength-tunable photochromic compositions and systems are disclosed. Nanoparticles photochromically darken in response to incident light by photo-oxidizing a dopant to reversibly create an optically absorbing mid-gap electronic state. The wavelengths that trigger photoch...