Importance

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Abstract

This apparatus tests the genuineness of a document carrying anticounterfeit protection in the form of a usually invisible, electrically conductive coating on at least part of a surface. The apparatus may be arranged to respond to the presence of a coating anywhere on the surface, or it may be arranged to respond only to a coating of specific contour, in a specific location. The apparatus shown comprises an array of contacts and means for supporting a document to be tested in conductive engagement with said contacts. Certain ones of the contacts engage the conductive layer, and are connected in an electric circuit which is completed through the conductive layer. Completion of the circuit is required to produce an indication that the document is genuine. The conductance of the conductive layer must be within a predetermined range in order to produce a signal indicating that the document is genuine. The contacts which engage areas of the document where there should be no conductive layer, may be connected in a second circuit which, if completed through a conductive layer, prevents the production of a signal indicating that the document is genuine.

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First Claim