Protective systems

Details Protective systems Protective systems

1973-06-14

1976-06-08

Swann, III, Glen R.

Communications: electrical

Systems

Call station

200 6193, 340274R, 340261, 340409, G08B 1302

Patent

active

039626962

ABSTRACT:
A monitoring system for use as an intruder alarm comprises a sensor loop including at least one set of normally-closed contacts. An integrator circuit is coupled to the sensor loop and provides an alarm signal to an alarm when a set of contacts has been actuated for a predetermined period.

REFERENCES:
patent: 2449168 (1948-09-01), Kertz
patent: 3070784 (1962-12-01), Strand
patent: 3531793 (1970-09-01), Sottenfeld
patent: 3626403 (1971-12-01), Ive
patent: 3665259 (1972-05-01), Brailsford

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