US Patent Issued to 3M Innovative Properties on May 19 for "IR reflective multilayer optical films" (Minnesota Inventor)

ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,873, issued on May 19, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"IR reflective multilayer optical films" was invented by Matthew B. Johnson (Woodbury, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An integral optical stack including a structured optical film having alternating first and second segments including plurality of polymeric layers. Each pair of first and second segments define an inclusion angle of between about 50 degrees and about 110 degrees therebetween. Planarizing films are disposed on opposite first and second sides of the structured optical film. Each of the first and second sides has an average peak-t...