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. 17, 2026
Filed:
Sep. 08, 2021
Applicant:
Lg Chem, Ltd., Seoul, KR;
Inventors:
Assignee:
LG CHEM, LTD., Seoul, KR;
Primary Examiner:
Int. Cl.
CPC ...
C08L 79/08 (2006.01); C08G 73/10 (2006.01); C08J 5/18 (2006.01); G02B 1/04 (2006.01);
U.S. Cl.
CPC ...
C08L 79/08 (2013.01); C08G 73/1057 (2013.01); C08G 73/1067 (2013.01); C08J 5/18 (2013.01); G02B 1/04 (2013.01); C08L 2201/08 (2013.01); C08L 2201/10 (2013.01); C08L 2203/16 (2013.01); C08L 2203/20 (2013.01);
Abstract
The present disclosure relates to a polyimide-based polymer film comprising a polyimide-based polymer containing a polyimide repeating unit synthesized by the reaction of an acid anhydride compound having a specific structure and a diamine compound, wherein a glass transition temperature is 400° C. or more, and a thickness direction retardation value at a thickness of 10 μm is 150 nm or less, and a substrate for a display device and an optical device using the same.