Dual-hologram identity card

Details Dual-hologram identity card Dual-hologram identity card

1976-10-12

1979-02-20

Corbin, John K.

Printed matter

Maps

40 22, 283 7, 350 367, G02B 2700

Patent

active

041403738

ABSTRACT:
An identity card is secured against forgery of the information thereupon and the appearance thereof by imparting coded information holographically to a photosensitive sheet of the card as coded, binary, optical bits in a pair of overlapping holograms, one hologram being readable only in coherent visible light and the other being readable only in coherent light outside the visible spectrum. The information is thereby made machine-readable.

REFERENCES:
patent: 3615123 (1971-10-01), Wuerker
patent: 3620590 (1971-11-01), Barker
patent: 3643216 (1972-02-01), Greenaway et al.
patent: 3647275 (1972-03-01), Ward
patent: 3807859 (1974-04-01), Sugaya et al.
patent: 4014602 (1977-03-01), Ruell
Wyant, "Testing Aspherics Using Two-Wavelength Holography", Applied Optics, vol. 10, No. 9, Sep. 1971, pp. 2113-2118.

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