The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2026
Filed:
Nov. 30, 2021
Applicant:
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Inventors:
Yoshiko Tanaka, Tokorozawa, JP;
Hikaru Hotta, Tsukuba, JP;
Shosei Kubota, Kashiwa, JP;
Takashi Kuroda, Moriya, JP;
Akinobu Ushiyama, Moriya, JP;
Assignee:
DAI NIPPON PRINTING CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/14 (2015.01); C08J 5/18 (2006.01); G02F 1/1335 (2006.01); H10K 59/80 (2023.01);
U.S. Cl.
CPC ...
G02B 1/14 (2015.01); C08J 5/18 (2013.01); G02F 1/133528 (2013.01); C08J 2367/02 (2013.01); H10K 59/8791 (2023.02);
Abstract
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/mmor more at a polyester film surface, wherein a standard deviation 3σ of Martens hardness at the polyester film surface is 9.0 N/mmor more and 36.0 N/mmor less.