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Document security system

  • US 20040041707A1
  • Filed: 09/03/2002
  • Published: 03/04/2004
  • Est. Priority Date: 09/03/2002
  • Status: Active Grant
First Claim
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1. A document monitoring device comprising:

  • a plurality of sensors disposed about an area of a structure suitable for placement of one or more documents, each sensor producing a sensor output signal in response to sensing a response signal produced by a document; and

    a detection module coupled to receive sensor output signals from said sensors to produce a detection signal indicative of movement of a first document disposed on said structure, wherein a first set of sensor output signals that are produced by a first set of said sensors is associated with a first position of said first document and a second set of sensor output signals that are produced by a second set of said sensors is associated with a second position of said second document, wherein said detection signal is produced based on said first set of sensors and said second set of sensors.

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