Patent US3865967A successfully refreshed from Google Patents.
US3865967A
Expired / Lapsed
US
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Fluid pressurized electrical cables having means incorporated therewith for locating leaks
Assignee: Post Office
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Filing: 1973-04-23
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Granted: 1975-02-11
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Expires: 1993-04-23
Abstract
Abstract A fluid filled cable is provided with a plurality of ducts, each of which may be connected at one end to a manometer, the other end of each duct being open to the inside of the cable. The open ends of the ducts are at spaced intervals along the length of the cable, and the manometers are positioned at a common point at which there is external access to the cable. If a localized leak occurs in the cable, the position of the leak can be found by noting the manometer readings and carrying out a graphical analysis.
Inventors
- 👤 Jack Pritchett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:06
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/16; G01M3/18; G01M3/181; G01M3/26; G01M3/28; G01M3/2838; H; H01; H01B; H01B9/00; H01B9/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A fluid filled electric cable in which a leak at any point in the cable causes a continuous pressure gradiant drop along the entire cable, said cable comprising a fluid containing sheath, a plurality of fluid impermeable pressure transmitting conduits disposed within said sheath, said conduits each having an open end located within said sheath, said open ends being spaced from one another along the length of said sheath, the other end of each conduit terminating externally of said sheath, and a plurality of individual pressure indicating means, each said other end of said conduits being connected to a respective one of said individual pressure indicating means for indicating the individual pressure at said open end of each conduit.
Claim 2
Dependent Claim
119 words
A fluid filled electric cable in which a leak at any point in the cable causes a continuous pressure gradiant drop along the entire cable, said cable comprising a fluid containing sheath, a plurality of fluid impermeable pressure transmitting conduits disposed within said sheath, said conduits each having an open end located within said sheath, said open ends being spaced from one another along the length of said sheath, the other end of each conduit terminating externally of said sheath, and a plurality of individual pressure indicating means, each said other end of said conduits being connected to a respective one of said individual pressure indicating means for indicating the individual pressure at said open end of each conduit.
Claim 3
Dependent Claim
20 words
A fluid filled electric cable as set forth in claim 1 wherein each said pressure indicating means constitutes a manometer.
Claim 4
Dependent Claim
22 words
A fluid filled electric cable as set forth in claim 1 in which said open ends are equi-spaced one from the other.
Claim 5
Dependent Claim
25 words
A fluid filled electric cable as claimed in claim 3 in which said fluid is a dry gas at a pressure greater than atmospheric pressure.
Claim 6
Dependent Claim
22 words
A fluid filled electric cable as set forth in claim 4 in which said conduits form electrically conductive paths along the cable.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |