Secure card and sensing system

Details Secure card and sensing system Secure card and sensing system

1984-10-04

1987-04-07

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

235380, 356 71, H04Q 900

Patent

active

046564730

ABSTRACT:
An identification card is disclosed as for supporting commercial or other significant transactions involving a designated subject. The card incorporates a machine-readable record and is produced with an individual birefringent characteristic to modulate a light beam for card identification. In one embodiment, the card incorporates apparent stress waves to modulate an orientation-frequency characteristic (e.g. polarization angle) of a light beam. The machine-readable record on the card indicates the characteristic birefringence for confirming the card to be authentic. Methods are disclosed for producing and testing the cards. A system is disclosed for sensing card characteristics by modulated light including polarized light techniques to record and verify the cards with allowance for changes, as by card aging.

REFERENCES:
patent: 4450348 (1984-05-01), Stockburger et al.
patent: 4476468 (1984-10-01), Goldman
patent: 4501439 (1985-02-01), Antes
patent: 4544836 (1985-10-01), Galvin et al.

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