US Patent Issued to HRL Laboratories on March 31 for "Photochromic compositions, systems, and methods triggered using visible or nir light" (California Inventors)

ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,243, issued on March 31, was assigned to HRL Laboratories LLC (Malibu, Calif.).

"Photochromic compositions, systems, and methods triggered using visible or nir light" 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 photoc...