Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2006-10-31
2006-10-31
Hirchfeld, Andrew H. (Department: 2854)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C235S451000
Reexamination Certificate
active
07129709
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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Hamdan Wasseem H.
Hirchfeld Andrew H.
Neifeld IP Law P.C.
WHD Electronische Prueftechnik
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