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:
Aug. 01, 1995
Filed:
Mar. 23, 1993
Hidekazu Hoshino, Kanagawa, JP;
Hidemi Haga, Kanagawa, JP;
NHK Spring Co., Ltd., , JP;
Abstract
Provided is a system for identifying the authenticity of an article which is reliable, and would not restrict the freedom of design. An identification region is defined on the article for identification purpose. The identification region comprises a light reflecting layer which is adapted to transmit visible light and reflect light of a certain wavelength other outside the visible light band with a certain diffractive property. Therefore, the identification region is hardly visible to human eyes, and this not only discourages an attempt to counterfeit the identification region but also would not affect the external appearance of the article. Further, the visible light which has passed through the reflecting layer and reflected by the surface of the article itself or an underlying layer is prevented from reaching the light detecting device so that spurious noises which may disturb the identification process can be eliminated.