Ultrasonic and capacitive electronic key systems
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United States of America Patent
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Jul 21, 1981
Issued Date -
N/A
app pub date -
Nov 26, 1979
filing date -
Oct 2, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Electronic key systems using no moving parts are disclosed. In one embodiment capacitive sensing is provided and in a further embodiment ultrasonic sensing is used. Both embodiments can employ binary coding for use with local or remote logic circuits to control locking mechanisms.
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