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. 10, 2007
Filed:
Feb. 12, 2003
Hidekazu Hoshino, Yokohama, JP;
Itsuo Takeuchi, Yokohama, JP;
Mutsumi Sasaki, Yokohama, JP;
NHK Spring Co., Ltd., Yokohama, JP;
Abstract
The present invention provides a discrimination medium A for discriminating the authenticity of an article by providing an optically discriminating mark on the article. A filmhaving a light reflecting layer of a polymer cholesteric liquid crystal having a circular polarization light selectivity for reflecting a specific circular polarization light is fixed to a part of the surface of a support. A printed portion is made by printing on the portions other than the filmof the supportin substantially the same color as that shown when the filmis viewed from the front. The discrimination medium A appears to be red at the supportand the filmwhen viewed from the front (although the film has a metallic luster), but at a larger viewing angle, the filmchanges to blue by the blue-shift of the polymer cholesteric liquid crystal so as to exhibit a color different from that of the support