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:
Apr. 21, 2025
Filed:
Mar. 11, 2024
Toppan Holdings Inc., Tokyo, JP;
Ryuji Shiraishi, Taito-ku, JP;
TOPPAN HOLDINGS INC., Tokyo, JP;
Abstract
A light control sheet includes an adhesive layer attached to a transparent material, and a light control layer attached to the transparent material via the adhesive layer, the light control layer having a transparent state or an opaque state depending on a voltage is applied to the light control layer. At least one of the adhesive layer and the light control layer includes a filter absorbing part of light in the visible region. Transmittance is 10% or less for light with a wavelength range of 420 nm or less passing through the light control window from the light control sheet toward the transparent material in a first direction, and light from a standard light source D65 passing through the light control window from the transparent material toward the light control sheet in a second direction has a yellowness index YI of 10 or less according to JIS K 7373: 2006.