Anti-theft alarm with coded radio link

Details Anti-theft alarm with coded radio link Anti-theft alarm with coded radio link

1977-01-05

1978-08-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340 63, 340166R, G08B 1300

Patent

active

041107381

ABSTRACT:
At a protected site, intrusion sensors are connected to a radio transmitter which signals a remote receiver. In the transmitter, a code matrix is scanned in response to signals from a clock pulse generator to produce a coded pulse sequence. The receiver has a matching matrix arrangement to render it responsive only to the particular pulse sequence of its associated transmitter. When the system is not in use, the receiver is stored in a container arranged to automatically deactivate the system when the receiver is present and automatically activate the system when the receiver is removed.

REFERENCES:
patent: 3047843 (1962-07-01), Katz et al.
patent: 3230355 (1966-01-01), Chu
patent: 3257653 (1966-06-01), McCorkindale
patent: 3513466 (1970-05-01), Isaacs et al.
patent: 3646515 (1972-02-01), Vodehnal
patent: 3703714 (1972-11-01), Andrews
patent: 3902075 (1975-08-01), Oros

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