Communications: electrical – Systems – Call station
Patent
1975-09-02
1977-01-25
Caldwell, John W.
Communications: electrical
Systems
Call station
340261, 256 1, 200182, G08B 2300
Patent
active
040053970
ABSTRACT:
A sound or other such alarm which in practice is mounted on a fence so as to signal any attempt to surmount or bypass the fence, such attempt being an alarm condition; such alarm being characterized by its ability to distinguish said alarm condition from non-alarm conditions, thus having minimal false alarms, even though in all instances the alarm basically is triggered into operation in response to vibratory movement of the fence. This ability of the alarm to distinguish between alarm and non-alarm conditions is achieved by requiring a selected number of alarm-operating pulses (i. e. a selected number of vibrations in the fence) before the alarm operates.
REFERENCES:
patent: 2345771 (1944-04-01), Reynolds
patent: 2403503 (1946-07-01), Coulter
patent: 3276007 (1966-09-01), White
patent: 3745552 (1973-07-01), Wilt
patent: 3763482 (1973-10-01), Burney et al.
patent: 3806909 (1974-04-01), Bound
Caldwell John W.
International Fence Alarm Corporation
Wannisky William M.
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