ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,474,514, issued on Nov. 18, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).
"Optical camouflage filters" was invented by Guanglei Du (Pittsford, N.Y.), John A. Wheatley (Lake Elmo, Minn.), Yi Hang Lv (Shanghai), Anthony M. Renstrom (Forest Lake, Minn.), Neeraj Sharma (Lake Elmo, Minn.) and Fuguo Xu (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "A system may include one or both of a light emitter and a light receiver, and an optical filter. The optical filter includes a wavelength selective scattering layer. The wavelength selective scattering layer may have a near-infrared scattering ratio of less than about 0.9. The filter may...