US Patent Issued to Dai Nippon Printing on Feb. 3 for "Polyester film, polarizing plate and image display device" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,541,042, issued on Feb. 3, was assigned to Dai Nippon Printing Co. Ltd. (Tokyo).

"Polyester film, polarizing plate and image display device" was invented by Yoshiko Tanaka (Tokorozawa, Japan), Hikaru Hotta (Tsukuba, Japan), Shosei Kubota (Kashiwa, Japan), Takashi Kuroda (Moriya, Japan) and Akinobu Ushiyama (Moriya, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure addresses the problem of providing a polyester film having favorable pencil hardness without an increase in the thickness. Disclosed is a polyester film having an average Martens hardness of 140.0 N/mm2 or more at a polyester film surface, wherein a standard deviation ...