Counterfeit protected document

Details Counterfeit protected document Counterfeit protected document

1989-01-18

1991-05-28

Bell, Paul A.

Printed matter

Method

283 72, 283 85, 283 93, 283 94, 283902, 356374, B42D 1500

Patent

active

050187678

ABSTRACT:
A method and product, resulting from application of the method, for making images on a document that will not be replicated properly by electro-optical scanning and copying devices. Documents that cannot be replicated by known copying machines or other replicating devices are produced according to the invention method, as well as alternative methods. All of the methods disclosed herein are instructive for making the images and art work on such documents by forming lines into various patterns in a manner imitative of intaglio or gravure printing. The pitch of the lineations is deliberately selected so as to vary minutely from the pitch of the scanning trace of various copying machines such as photocopiers, video opticons, and the like. The variation in pitch may be obtained by deliberately manufacturing the document with the desired pitch or, subsequent to the image placement therein, altering the dimensions or geometry of the document so as to effectively skew the pitch parameter.

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