Anti-forgery and anti-theft system, particularly for secured documents
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Feb 12, 2004
app pub date -
Mar 21, 2003
filing date -
Sep 21, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An anti forgery and/or anti-theft system is disclosed for use with documents and things. An LCR oscillating circuit is printed on or embedded in the document or thing. Because of the resistance, when the oscillating circuit is placed in a suitable high frequency electromagnetic field, heat is generated due to the power dissipated in the resistor. The heat can be used to cause a change in color of a thermochromic pigment, or the heat can be detected by a suitable thermographic measuring device such as an infrared video camera.
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