ALEXANDRIA, Va., July 3 -- United States Patent no. 12,345,904, issued on July 1, was assigned to HOYA Optical Labs of America Inc. (Lewisville, Texas).
"Dye microenvironment" was invented by Steven Harold Nahm (Ramsey, Minn.), David Jerrel Kissel (Ramsey, Minn.) and Richard Blacker (Ramsey, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optimized photochromic dye microenvironment isolated from and dispersed within a distinct host phase."
The patent was filed on June 30, 2023, under Application No. 18/346,077.
*For further information, including images, charts and tables, please visit: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&...