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:
Jul. 07, 2020
Filed:
Nov. 28, 2017
Zeon Corporation, Chiyoda-ku, Tokyo, JP;
Hiromasa Hashimoto, Tokyo, JP;
Masakazu Saito, Tokyo, JP;
ZEON CORPORATION, Chiyoda-ku, Tokyo, JP;
Abstract
An optical layered body including a substrate layer, and an optically anisotropic layer containing at least one liquid crystal cured layer, wherein a light transmittance of the substrate layer at a wavelength of 390 nm is 1% or less, and an in-plane retardation Re0(450) at a wavelength 450 nm before the optical layered body is exposed to the xenon lamp, an in-plane retardation Re0(550) at a wavelength 550 nm before the optical layered body is exposed to the xenon lamp, an in-plane retardation Re300(450) at the wavelength 450 nm after the optical layered body was exposed to the xenon lamp for 300 hours, and an in-plane retardation Re300(550) at the wavelength 550 nm after the optical layered body was exposed to the xenon lamp for 300 hours satisfy the following formulae (1) and (2):0.95≤300(450)/0(450)≤1.05  (1),0.95≤300(550)/0(550)≤1.05  (2).