Intrusion alarms

Details Intrusion alarms Intrusion alarms

1975-09-05

1976-09-14

Swann III, Glen R.

Communications: electrical

Systems

Call station

340258A, 340276, 312252, G08B 1318

Patent

active

039809986

ABSTRACT:
An ultrasonic intrusion alarm is described. In the specific embodiment described with reference to the drawings, the alarm includes a transmitter and a receiver both mounted in a cylindrical housing. The housing is turnably held in contact with a base by a grill cloth. In use the housing is turned to direct the transmitter. The grill cloth prevents the area protected by the alarm being visually determined from externally of the alarm.

REFERENCES:
patent: 3512155 (1970-05-01), Bloice
patent: 3691556 (1972-09-01), Bloice
patent: 3886549 (1975-05-01), Cheal et al.
Mountain West Alarm Supply Co. Cat., Phoenix, Ariz., 1974, Inside of Cover, pp. 9, 11, 19.

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