US Patent Issued to 3M Innovative Properties on May 19 for "Multilayer optical film" (Minnesota Inventors)

ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,812, issued on May 19, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"Multilayer optical film" was invented by Kevin T. Huseby (Oakdale, Minn.), Stephen A. Johnson (Woodbury, Minn.), Samuel A. Minno (St. Paul, Minn.), Lin Zhao (Woodbury, Minn.), William T. Fay (Woodbury, Minn.), Robert L. Brott (Woodbury, Minn.) and Gilles J-B Benoit (Minneapolis).

According to the abstract* released by the U.S. Patent & Trademark Office: "A multilayer optical film includes a plurality of optical repeat units. Each of the optical repeat units includes at least four sequentially arranged first through fourth layers including first and third layers having respective f-ratios f1 and...