Method of marking and of identifying objects marked by electrically conducting elements
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United States of America Patent
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-
Sep 21, 1982
Grant Date -
N/A
app pub date -
Jun 24, 1980
filing date -
Jun 26, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of marking and of identifying objects (1) which are non-conductors of electricity by inclusion of conducting masses and detection by passage through a high-frequency electromagnetic field and detection of the variation in the corresponding response signal picked up. Metallic wires (2) each selected from a range of specimens of different electric conductivity are used as marking elements. The responses are measured which are each characteristic of one specimen and of a predetermined code value. The invention applies to the recognition of the authenticity of cards or documents thus previously marked.
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