US5068642A
Expired / Lapsed
US
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Alarm or warning device with sensing means in the form of a d.c. biased shielded coaxial cable
Assignee: HESA SpA VIALE TEODORICO 19/1 - 20149 MILANO - ITALY
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Filing: 1990-03-29
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Granted: 1991-11-26
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Expires: 2010-03-29
Abstract
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.
Inventors
- 👤 Vincenzo Hruby
- 👤 Raffaele Vizzotto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/26
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable.
Claim 2
Dependent Claim
90 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable.
Claim 3
Dependent Claim
27 words
Alarm or warning device as in claim 1, wherein said coaxial cable is positioned under a soil surface, along the outer periphery of a property under control.
Claim 4
Dependent Claim
34 words
Alarm or warning device as in claim 1, wherein said coaxial cable is positioned on a soil surface or onto a suitable support in proximity of or in contact with movable objects under control.
Claim 5
Dependent Claim
41 words
Alarm or warning device as in claim 1, used in the medical field for controlling the life functions of a patient, wherein said coaxial cable is fixed to the bed or to any other supports holding the body of the patient.
Claim 6
Dependent Claim
20 words
Alarm or warning device as in claim 1, wherein the electrical capacity of said coaxial cable is about 80 pF/m.
Claim 7
Dependent Claim
24 words
Alarm or warning device as in claim 1, wherein said D.C. constant biasing potential difference of the coaxial cable is equal to 12 V.
Claim 8
Dependent Claim
125 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable; and wherein said coaxial cable comprises, starting from its center: an electric conductor, a first insulating sheath, a first metal shielding, a second insulating sheath, a second metal shielding, and a third outer insulating sheath.
Claim 9
Dependent Claim
125 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable; and wherein said coaxial cable comprises, starting from its center: an electric conductor, a first insulating sheath, a first metal shielding, a second insulating sheath, a second metal shielding, and a third outer insulating sheath.
Claim 10
Dependent Claim
54 words
Alarm or warning device as in claim 7, wherein said first and second inner sheaths are of polytetrafluoroethylene and have a resistivity factor of 1.10 15 Ωm; said outer sheath is of polyethylene and has a resistivity factor of 1.10 12 Ωm; and said first and second metal shieldings are of silver copper braid.
Claim 11
Dependent Claim
145 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable; wherein said coaxial cable is positioned under a soil surface, along the outer periphery of a property under control, and wherein, parallel to said cable and on the side external to that under control there is positioned a substantially vertical continuous baffle slab of material having a greater density than that of the surrounding soil.
Claim 12
Dependent Claim
145 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable; wherein said coaxial cable is positioned under a soil surface, along the outer periphery of a property under control, and wherein, parallel to said cable and on the side external to that under control there is positioned a substantially vertical continuous baffle slab of material having a greater density than that of the surrounding soil.
Claim 13
Dependent Claim
36 words
Alarm or warning device as in claim 9, wherein the distance between said coaxial cable and said slab is between 10 and 30 cm, and the cable is positioned along the median part of said slab.
Claim 14
Dependent Claim
27 words
Alarm or warning device as in claim 9, wherein said baffle slab consists of an aligned set of concrete elements, substantially in the form of channel sections.
Claim 15
Dependent Claim
152 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable; and wherein the shielding of the coaxial cable is grounded, the electric conductor of the coaxial cable is connected to the base of a semiconductor device by way of a capacitor and to the positive pole of the direct current supply by way of a first resistor, the base of the semiconductor device being moreover grounded by way of a second resistor.
Claim 16
Dependent Claim
152 words
Alarm or warning device, comprising sensing means in the form of an electrically charged capacitor and an electronic circuit adapted to detect variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, wherein said sensing means consist essentially of at least one shielded coaxial cable having shielding and an inner conductor, one or both ends of which cable are connected to said electronic circuit and wherein a D.C. constant biasing potential difference is applied between the shielding and the inner conductor of said cable; and wherein the shielding of the coaxial cable is grounded, the electric conductor of the coaxial cable is connected to the base of a semiconductor device by way of a capacitor and to the positive pole of the direct current supply by way of a first resistor, the base of the semiconductor device being moreover grounded by way of a second resistor.
Claim 17
Dependent Claim
20 words
Alarm or warning device as in claim 12, wherein said first and second resistors have a value of 3,300 MΩ.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |