Method of testing documents provided with optico-diffractively effective markings
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United States of America Patent
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Aug 28, 2007
Grant Date -
Sep 28, 2006
app pub date -
May 11, 2006
filing date -
Apr 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method of examining the authenticity of a document provided with an optico-diffractively effective element or hologram by subjecting the hologram to capacitive coupling of a voltage and deriving a signal representative of the voltage for comparison with a reference signal representative of a hologram of an authentic document.The method may be improved by providing, between individual segments of the hologram, additional security indicia providing a signal in response to being irradiated by electromagnetic radiation of a predetermined frequency.
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