Electronic proximity identification system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 8, 1985
Grant Date -
N/A
app pub date -
Dec 10, 1982
filing date -
Dec 10, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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