US4155083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite wire and fence made therefrom useful for security purposes
Assignee: Bekaert NV SA
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Filing: 1977-04-26
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Granted: 1979-05-15
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Expires: 1997-04-26
Abstract
Abstract At least two conductive wire elements which are separated from each other by a thin insulating layer such that as soon as a pressure is exerted on the composite wire at least one of the electrical characteristics, contact resistance and/or capacitance between the elements, changes to a measurable extent. A fence constructed of such composite wire has a circuit connected with both conductive wire elments for detecting any deviation in the nominal value of contact resistance and/or capacitance between them and for controlling an alarm circuit responsive to such deviation.
Inventors
- 👤 Joris Slaats
- 👤 Jan Vandenbogaerde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:21
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/12; G08B13/122; G08B13/22; G08B13/26; H; H01; H01B; H01B7/00; H01B7/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A composite wire comprising a number of elongated conductive elements adapted for use in a security fence, at least two of said elements being separated from each other by a thin insulating layer such that as soon as a pressure is exerted on the composite wire the contact resistance between said elemens changes to a measurable extent.
Claim 2
Dependent Claim
57 words
A composite wire comprising a number of elongated conductive elements adapted for use in a security fence, at least two of said elements being separated from each other by a thin insulating layer such that as soon as a pressure is exerted on the composite wire the contact resistance between said elemens changes to a measurable extent.
Claim 3
Dependent Claim
31 words
A wire according to claim 1 comprising a first central thread-formed conductor enveloped in a thin layer of insulating material and a number of second conductors wound around said first conductor.
Claim 4
Dependent Claim
30 words
A wire according to claim 1 comprising a number of conductive elements twisted into a strand of which at least one is separated from the others by an insulating layer.
Claim 5
Dependent Claim
43 words
A fence comprising a wire as set forth in claim 1, a circuit connected with both of said two conductive elements for detecting any deviation in the nominal value of the contact resistance between them, and an alarm circuit controlled by this circuit.
Claim 6
Dependent Claim
27 words
A fence according to claim 4 including posts for supporting said wire under tension wherein the wires tensioned between said supporting posts are connected to movement-sensing detectors.
Claim 7
Dependent Claim
22 words
A fence according to claim 4 wherein one or more wires are incorporated in a support in the form of a mesh.
Claim 8
Dependent Claim
14 words
A fence according to claim 6 wherein said support is formed by a frame.
Claim 9
Dependent Claim
24 words
A fence according to claim 4 which includes a solid element made from a hardening material in which at least one wire is embedded.
Claim 10
Dependent Claim
56 words
A composite wire comprising a number of elongated conductive elements adapted for use in a security fence, at least two of said elements being separated from each other by a thin insulating layer such that as soon as a pressure is exerted on the composite wire the capacitance between said elements changes to a measurable extent.
Claim 11
Dependent Claim
56 words
A composite wire comprising a number of elongated conductive elements adapted for use in a security fence, at least two of said elements being separated from each other by a thin insulating layer such that as soon as a pressure is exerted on the composite wire the capacitance between said elements changes to a measurable extent.
Claim 12
Dependent Claim
35 words
A fence comprising a wire as set forth in claim 9, a circuit connected with both of said conductive elements for detecting any deviation in capacitance between them, and an alarm controlled by this circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |