US Patent Issued to 3M Innovative Properties on Sept. 1 for "Optical film and optical system" (Minnesota Inventors)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,724,188, issued on Sept. 1, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"Optical film and optical system" was invented by John D. Le (Woodbury, Minn.), Timothy L. Wong (West St. Paul, Minn.), Benjamin G. Sonnek (Mahtomedi, Minn.), Kayla A. McGrath (Cottage Grove, Minn.) and David J.W. Aastuen (Shoreview, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical film includes a first optical stack disposed on a visible light absorbing second optical stack. Each of the first and second optical stacks includes a plurality of alternating polymeric first and second layers. The first layers have a higher index of refraction than the ...