Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1976-03-24
1978-04-25
Tokar, M.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324 5A, 324239, 324227, 250559, 340149R, G01R 3300
Patent
active
040865274
ABSTRACT:
An authentication method for standardized objects, such as in particular monetary articles, in which an object to be authenticated is introduced into the field located between an emitter and a receiver delivering at least an alternative physical quantity, whose quantitative alteration produced by the presence of said object in said field is measured, the result being compared with a reference value pre-stored in a memory and distinctive of the object to authenticate, whereby, within a tolerance approximation, an authentication criterion is deducted, method characterized by the fact that said alteration is measured at different frequencies, that corresponding alterations are successively measured and then simultaneously compared with said respective reference quantities.
REFERENCES:
patent: 3085195 (1963-04-01), Anderson
patent: 3113263 (1963-12-01), Collins
patent: 3155941 (1964-11-01), Mims
patent: 3638238 (1972-01-01), Milford
patent: 3707672 (1972-12-01), Miller
patent: 3833850 (1974-09-01), Weber
patent: 3869663 (1975-03-01), Tschierse
Crouzet
Hobbs Marmaduke A.
Tokar M.
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