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:
Jun. 22, 2010
Filed:
Nov. 17, 2005
Seiji Umemoto, Ibaraki, JP;
Miki Shiraogawa, Ibaraki, JP;
Takahiro Fukuoka, Ibaraki, JP;
Naoki Takahashi, Ibaraki, JP;
Kentarou Takeda, Ibaraki, JP;
Seiji Umemoto, Ibaraki, JP;
Miki Shiraogawa, Ibaraki, JP;
Takahiro Fukuoka, Ibaraki, JP;
Naoki Takahashi, Ibaraki, JP;
Kentarou Takeda, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki-Shi, Osaka, JP;
Abstract
A sheet with anti-counterfeit functions for making counterfeiting highly difficult in the case where authentication information is recorded using the properties of cholesteric liquid crystal is provided. A cholesteric liquid crystal layerhaving a selective reflected wavelength band in at least the visible light region is provided in such a manner that this cholesteric liquid crystal layeris a single layer of which thickness is approximately uniform, and an authentication regionof which selective reflected wavelength band is different is provided in at least one place. Preferably, an adhesive layeris provided on one side of the cholesteric liquid crystal layer. Preferably, a baseis provided between the cholesteric liquid crystal layerand the adhesive layer. Preferably, a light absorbing layeris provided on adhesive layerof the cholesteric liquid crystal layer