Electronic proximity identification system

Details Electronic proximity identification system Electronic proximity identification system

1982-12-10

1985-10-08

Pitts, Harold I.

Registers

Systems controlled by data bearing records

Credit or identification card systems

343 65SS, G06K 500

Patent

active

045462410

ABSTRACT:
An electronic identification and recognition system including a portable card having a circuit therein for generating and transmitting and identifying signal comprising predetermined frequency pulses. The card functions in cooperation with a reader which radiates a radio frequency carrier signal received by an antenna in the card. This signal is used both to power the circuit of the card and to provide the basic frequency signal which is modified to generate secondary frequency signals which are transmitted back to the reader in a predetermined sequence identifying the card.

REFERENCES:
patent: 3806874 (1974-04-01), Ehrat
patent: 4019181 (1977-04-01), Olsson
patent: 4069472 (1978-01-01), Kamata
patent: 4242663 (1980-12-01), Slobodin
patent: 4333078 (1982-06-01), Henoch
patent: 4384288 (1983-05-01), Walton
patent: 4388524 (1983-06-01), Walton
patent: 4399437 (1983-08-01), Falck

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