Method of marking and of identifying objects marked by electrica

Details Method of marking and of identifying objects marked by electrica Method of marking and of identifying objects marked by electrica

1980-06-24

1982-09-21

Yusko, Donald J.

Registers

Coded record sensors

235492, 324 58C, 340561, G01R 2702, G06K 700, G08B 1322

Patent

active

043508839

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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patent: 3803571 (1974-04-01), Luz
patent: 3953796 (1976-04-01), Keller
patent: 4220915 (1980-09-01), Kawamoto et al.

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