Ultrasonic and capacitive electronic key systems

Details Ultrasonic and capacitive electronic key systems Ultrasonic and capacitive electronic key systems

1979-11-26

1981-07-21

Yusko, Donald J.

Communications: electrical

Digital comparator systems

340543, H04Q 900, G08B 1316

Patent

active

042801192

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.

REFERENCES:
patent: 3699311 (1972-10-01), Dunbar
patent: 3869082 (1975-03-01), Ludin
patent: 4017834 (1977-04-01), Cuttill et al.
patent: 4197524 (1980-04-01), Salem
patent: 4210900 (1980-07-01), Shavit

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