Appliance removal alarm system for motels

Details Appliance removal alarm system for motels Appliance removal alarm system for motels

1974-09-18

1976-12-07

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340171A, 340223, 340908, 343 65R, G08B 2500, H04Q 900

Patent

active

RE0290688

ABSTRACT:
A system for the prevention of the theft of televisions sets and other appliances from motels and the like requires the modification of the appliance by connecting a quartz crystal resonator across its terminals. A frequency-modulated oscillator connected to a transmission line linking all of the appliances is employed to stimulate the crystals in sequence. A transmit-receive switch operating at 100 herz frequency and phase detection between the oscillator and the echoes from the crystals improve selectivity, while a counter keeps track of the crystals heard from. An alarm and a visual display of a number indicate the time and place of a theft.

REFERENCES:
patent: 3022493 (1962-02-01), Tschumi et al.
patent: 3092829 (1963-06-01), Kleist
patent: 3117277 (1964-01-01), DeMagondeaux
patent: 3145380 (1964-08-01), Currie
patent: 3171108 (1965-02-01), MacKeen
patent: 3253588 (1966-05-01), Voilleumier et al.
patent: 3432851 (1969-03-01), Cox, Jr. et al.
patent: 3432852 (1969-03-01), Arnold
patent: 3482243 (1969-12-01), Buchsbaum
patent: 3508260 (1970-04-01), Stein
patent: 3550090 (1970-12-01), Baker et al.

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