Security system using conductive and non-conductive regions

Details Security system using conductive and non-conductive regions Security system using conductive and non-conductive regions

2011-04-05

2011-04-05

Ross, Dana (Department: 3725)

Printed matter

Having revealable concealed information, fraud preventer or...

And electrically conductive material

C281S002000, C283S061000, C283S072000, C283S082000, C283S084000, C283S094000, C283S095000, C283S100000, C283S901000

Reexamination Certificate

active

07918485

ABSTRACT:
Disclosed is an item, for example a document, including a substrate having thereon a multiplicity of separate printed markings, wherein the printed markings include both conductive printed markings and substantially non-conductive printed markings. The different conductive and substantially non-conductive regions on the substrate can be detected, for example by measuring the resistance or current of each printed marking. The pattern of different conductive and substantially non-conductive regions can be used as a security pattern of authenticity that cannot be replicated by standard office equipment, and/or can be used to encrypt information in binary code form in the item. A system for forming and detecting the different printed markings is also described.

REFERENCES:
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U.S. Appl. No. 11/548,775, filed Oct. 12, 2006.
U.S. Appl. No. 11/548,774, filed Oct. 12, 2006.

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