US Patent Issued to HOYA Optical Labs Of America on July 29 for "Photochromic polyurethane laminate" (Minnesota Inventors)

ALEXANDRIA, Va., July 30 -- United States Patent no. 12,372,687, issued on July 29, was assigned to HOYA Optical Labs Of America Inc. (Lewisville, Texas).

"Photochromic polyurethane laminate" was invented by Hannah Vu (New Brighton, Minn.), Hideyo Sugimura (North Oaks, Minn.), Ping Fan (Ramsey, Minn.) and Hao Vu (New Brighton, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A photochromic polyurethane laminate wherein the photochromic polyurethane layer of the laminate has been crosslinked with an isocyanate-active prepolymer using a crosslinking agent. The crosslinking agent is formulated to have at least three functional groups that are reactive with functional groups of the polyurethane or of the iso...