Magnetic document validator employing remanence and saturation m

Details Magnetic document validator employing remanence and saturation m Magnetic document validator employing remanence and saturation m

1990-01-10

1991-11-26

Levy, Stuart S.

Registers

Coded record sensors

Particular sensor structure

235450, 324228, G06K 708, G01N 2772, G01R 3312

Patent

active

050685198

ABSTRACT:
A method of and apparatus for determining the genuineness of a document such as a currency note printed at least in part with magnetizable ink in which there is produced a first signal as a measure of the saturation magnetization of a portion of the document printed with the ink and a second signal as a measure of the remanent magnetization of said portion and in which the ratio of the second signal to the first signal is determined as a measure of genuineness of the document.

REFERENCES:
patent: 3599153 (1971-08-01), Lewis et al.
patent: 3796859 (1974-03-01), Thompson
patent: 4038596 (1977-07-01), Lee
patent: 4617458 (1986-10-01), Bryce
patent: 4764725 (1988-08-01), Bryce

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