Multilayer identification card

Details Multilayer identification card Multilayer identification card

1976-08-09

1978-10-10

Evans, F. L.

Printed matter

Maps

40 22, 283 7, 350 360, G09F 302

Patent

active

041193610

ABSTRACT:
A multi-ply identification card for storage of machine-readable information includes optical markings disposed between protective layers. At least one of the protective layers can be penetrated by infrared light, and both are opaque to light of lesser wavelengths. The optical markings have a fine structure with at least 300 lines per mm and the protective layers are so connected to the optical markings that the markings are destroyed if one of the protective layers is removed.

REFERENCES:
patent: 3620590 (1971-11-01), Barker
patent: 3732640 (1973-05-01), Changnon
patent: 3802101 (1974-04-01), Scantlin
patent: 3869301 (1975-03-01), Decker et al.
patent: 3894756 (1975-07-01), Ward
patent: 3919447 (1975-11-01), Kilmer, Jr. et al.
Fant et al., "Infrared Transparent Credit Card," IBM Tech. Discl. Bulletin, vol. 9, No. 7, Dec. 1966, p. 870.

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