US Patent Issued to HRL Laboratories on Oct. 6 for "Rapidly reversible and wavelength-tunable photochromic compositions, systems, and methods" (California Inventors)

ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,754,443, issued on Oct. 6, was assigned to HRL Laboratories LLC (Malibu, Calif.).

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

According to the abstract* released by the U.S. Patent & Trademark Office: "Rapidly reversible 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 ph...