US Patent Issued to 3M Innovative Properties on July 14 for "Two-factor authentication film" (Minnesota, Wisconsin Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,681,213, issued on July 14, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"Two-factor authentication film" was invented by John A. Wheatley (Stillwater, Minn.), Gilles J. Benoit (Minneapolis), Mark A. Roehrig (Stillwater, Minn.), Bharat R. Acharya (Woodbury, Minn.), Serena L. Schleusner (Roberts, Wis.) and Zhaohui Yang (North Oaks, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical film (100) includes a plurality of polymeric layers (40) disposed between opposing first (11) and second (12) outer layers, a thinnest polymeric layer in the plurality of polymeric layers disposed closer to the first outer layer (11) and a thick...