Patent US4446892A successfully refreshed from Google Patents.
US4446892A
Expired / Lapsed
US
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Method and apparatus for monitoring lengths of hose
Assignee: Maxwell AG
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Filing: 1980-09-03
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Granted: 1984-05-08
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Expires: 2000-09-03
Abstract
Abstract A fluid transport hose having two or more plies comprising a sensing element located between the plies, the sensing element being responsive to the electromagnetic properties of fluid between the plies as a result of a rupture of the inner ply. Alternatively, the sensing element may be adapted to respond to the failure of an inner ply of the hose by presenting an open circuit.
Inventors
- 👤 Anthony J. Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:17
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/12; F16L11/133; F17; F17D; F17D5/00; F17D5/02; F17D5/06; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; G01M3/045; G01M3/047; G01M3/16; G01M3/18; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; Y; Y10; Y10S; Y10S116/00; Y10S116/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A hose for transporting fluid having electromagnetic properties, said hose having at least two plies between which fluid normally is not present; a sensing element between the plies and forming part of a detection circuit operable to signal the presence of fluid between the plies as a result of failure of one of the plies; and a particulate material located between the plies, the sensing element being responsive to at least one of the fluid's electromagnetic properties to initiate operation of the said circuit, and the particulate material enhancing the said at least one electromagnetic property of the fluid to which the sensing element is responsive.
Claim 2
Dependent Claim
106 words
A hose for transporting fluid having electromagnetic properties, said hose having at least two plies between which fluid normally is not present; a sensing element between the plies and forming part of a detection circuit operable to signal the presence of fluid between the plies as a result of failure of one of the plies; and a particulate material located between the plies, the sensing element being responsive to at least one of the fluid's electromagnetic properties to initiate operation of the said circuit, and the particulate material enhancing the said at least one electromagnetic property of the fluid to which the sensing element is responsive.
Claim 3
Dependent Claim
32 words
A fluid transport hose as claimed in claim 1, wherein the sensing element is in the form of a coil of conductive material wound helically around an inner ply of the hose.
Claim 4
Dependent Claim
21 words
A fluid transport hose as claimed in claim 1, wherein the sensing element is in the form of non-touching conductive elements.
Claim 5
Dependent Claim
21 words
A fluid transport hose as claimed in claim 1, wherein the sensing element is in the form of a magnetic tape.
Claim 6
Dependent Claim
44 words
A fluid transport as claimed in any of claims 1, 2, 3, and 4 wherein a secondary sensing element is provided on the surface of an outer ply of the hose, the secondary sensing element being responsive to a rupture of the outer ply.
Claim 7
Dependent Claim
41 words
A fluid transport hose as claimed in any of claims 1, 2, 3, and 4 in combination with a sensing unit, the sensing unit producing an output signal upon response of the sensing element to the rupture of an inner ply.
Claim 8
Dependent Claim
68 words
A fluid transport hose as claimed in any of claims 1, 2, 3, and 4, in combination with a sensing unit and a monitoring system, wherein the sensing unit produces an output upon response of the sensing element to the rupture of an inner ply and wherein the monitoring system periodically interrogates the sensing unit to determine whether or not an inner ply of the hose has ruptured.
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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |