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:
May. 05, 1987
Filed:
Dec. 14, 1984
Applicant:
Inventor:
David L Greenaway, Oberwil, CH;
Assignee:
LGZ Landis & Gyr Zug AG, Zug, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B42D / ; B44F / ; B05D / ; G02B / ;
U.S. Cl.
CPC ...
283 91 ; 283904 ; 35016217 ; 35016218 ; 35016223 ; 350-37 ; 427-7 ; 427162 ; 428 30 ; 428915 ; 428916 ;
Abstract
A security element for authenticating bank notes, credit cards, security passes and the like is disclosed. The security element incorporates a reflective-type diffraction grating, which grating comprises a continuous layer of reflecting material on which is deposited a layer of dielectric material. Non-continuous reflecting layer portions are embedded in the dielectric material. It is practically impossible to lay bare the diffraction grating without destroying it.