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:
Mar. 17, 1987
Filed:
Apr. 27, 1984
Applicant:
Inventors:
Victor B Chapman, Hants, GB;
Michael Potter, Hants, GB;
Assignee:
De La Rue Systems Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
356 71 ; 2504581 ;
Abstract
Luminescent security features in or on documents are detected using a detector comprising a fibre optic light guide arranged to transmit an interrogation beam originating from a source onto a document to be tested; and a housing in which a photo-diode array is mounted to receive luminescence emitted from the document. The photo-diode array is connected to electronic circuitry for discriminating between luminescence due to a security feature and other luminescence emitted by the document and for determining that a security feature has been detected.