Identification card including optically powered electronic circu

Details Identification card including optically powered electronic circu Identification card including optically powered electronic circu

1985-04-25

1988-05-03

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455605, 34082534, 34082554, 350359, 235454, H04B 900, G07D 700

Patent

active

047425733

ABSTRACT:
A card, such as a credit card or identification card, includes electronic circuitry which permits its identification by an identifying device. More particularly, optical radiation is transmitted from the identifying device to the card to be identified. The radiation is modulated with information by a modulating device included in the card and is retransmitted to the identifying device.

REFERENCES:
patent: 3153691 (1964-10-01), Kibler
patent: 3158746 (1964-11-01), Lehovic
patent: 3584220 (1971-06-01), Nomura et al.
patent: 3641316 (1972-02-01), Dethloff et al.
patent: 3951513 (1976-04-01), Masi
patent: 3989942 (1976-11-01), Waddoups
patent: 4114151 (1978-09-01), Denne et al.
patent: 4227261 (1980-10-01), Robertsson
patent: 4432614 (1984-02-01), McNeill et al.
patent: 4479264 (1984-10-01), Lockett et al.

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