Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-03-29
1991-11-26
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340566, 340573, G08B 1326
Patent
active
050686429
ABSTRACT:
Alarm or warning device using, as sensing means, a low voltage D.C. biased shielded coaxial cable. The cable is positioned along the periphery of the area under control, and one or both of its ends are connected to an electronic circuit adapted to detect the voltage variations at the cable ends, deriving from its capacity variations resulting from the subsonic shock waves caused by the movement of things or people in the neighborhood of the cable. The device of the invention is used in alarm systems against intrusions and thefts, both for real and personal property. In the first case, it is preferably positioned underground and it may also comprise screening means allowing to detect the movements coming from different directions. The device is also advantageously used in the medical field, for the remote control and warning of the life functions of a patient.
REFERENCES:
patent: 3728700 (1973-04-01), Duval
patent: 3760794 (1973-09-01), Basham
patent: 3875433 (1975-04-01), Uchikawa
patent: 3947835 (1976-03-01), Laymon
patent: 4197529 (1980-04-01), Ramstedt et al.
Hruby Vincenzo
Vizzotto Raffaele
Hesa S.p.A.
Mullen Jr. Thomas J.
Swann III Glen R.
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