Credit cards and other security documents

Details Credit cards and other security documents Credit cards and other security documents

1974-10-22

1978-03-28

Kilgore, Robert M.

Registers

Records

Magnetic

235450, 340149A, 427 48, G06K 1906, G06K 708, B44D 102

Patent

active

040811328

ABSTRACT:
A security document has a carrier and two layers of magnetizable material one overlying the other, the carrier and layers being all bonded together. One layer is for the recording of information and the other layer has a magnetic structure which can be examined for verification purposes. A preferred method of making the structured layer is to deposit magnetizable material to form the layer within the influence of a magnetic field from a recording on the information layer which is of the form of the structure. The recording is erased when the structured layer has been formed. The security document may be a credit card, a bank note or other valuable paper.

REFERENCES:
patent: 3015807 (1962-01-01), Pohm
patent: 3188613 (1965-06-01), Fedde
patent: 3328195 (1967-06-01), May
patent: 3420756 (1969-01-01), Terajima
patent: 3423740 (1969-01-01), Barrekette
patent: 3566356 (1971-02-01), Holm
patent: 3803634 (1974-04-01), Namikawa
patent: 3873975 (1975-03-01), Miklos
patent: 3878367 (1975-04-01), Fayling

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