Battery operated access control card
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 5, 1982
Grant Date -
N/A
app pub date -
Jan 14, 1981
filing date -
Jan 14, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An access control card for use in an access control system. A battery, a wireless signal sensor such as an antenna for receiving coded wireless signals such as coded radio frequency signals generated by a card reader, a clock connected to the battery and including a receiver are connected to the antenna for supplying a received signal based upon the coded radio frequency signal. A memory for stores first and second stored codes, and a transmit circuit connected to the antenna, to the clock and to the memory compares the first stored code to the received signal and transmits the second stored code when there is a match between the received signal and the first stored code.
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