Patent US5140847A successfully refreshed from Google Patents.
US5140847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable for detecting location of liquids
Assignee: Draka Deutschland GmbH and Co KG
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Filing: 1990-02-20
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Granted: 1992-08-25
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Expires: 2010-02-20
Abstract
Abstract A cable for detecting location of liquids comprises a core element sensitive to pulling or bending, a first sheathing of a material which swells in the liquid to be detected, and a sheathing affixed to the first sheathing and comprising a dense plaiting of high-stability yarn with low longitudinal expansion, and having a plaiting angle which is greater or smaller than the so-called neutral angle.
Inventors
- 👤 Norbert Tausch
- 👤 Wolfgang Diegmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:31
CPC Classifications
F; F17; F17D; F17D5/00; F17D5/02; F17D5/06; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/16; G01M3/165
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A cable for detecting the presence of a liquid comprising: a frangible conductive filament, a first sheathing surrounding said filament and being of a material which swells upon exposure to the liquid to be detected, and a second sheathing surrounding the first sheathing and having a structure which changes its length in response to radial expansion whereby the filament is broken adjacent the location of the liquid to be detected.
Claim 2
Dependent Claim
70 words
A cable for detecting the presence of a liquid comprising: a frangible conductive filament, a first sheathing surrounding said filament and being of a material which swells upon exposure to the liquid to be detected, and a second sheathing surrounding the first sheathing and having a structure which changes its length in response to radial expansion whereby the filament is broken adjacent the location of the liquid to be detected.
Claim 3
Dependent Claim
24 words
The invention as claimed in claim 1 wherein said second sheathing is a plaiting with a plaiting angle which differs from the neutral angle.
Claim 4
Dependent Claim
17 words
The invention as defined in claim 2 wherein said plaiting is formed by a yarn of fiberglass.
Claim 5
Dependent Claim
18 words
The invention as defined in claim 2 wherein said plaiting is formed by a yarn of polyamide fibers.
Claim 6
Dependent Claim
18 words
The invention as defined in claim 2 wherein said plaiting is formed by a yarn of carbon fibers.
Claim 7
Dependent Claim
15 words
The invention as defined in claim 2 wherein said conductive filament is an optical fiber.
Claim 8
Dependent Claim
15 words
The invention as defined in claim 1 wherein said conductive filament is an electrical conductor.
Claim 9
Dependent Claim
43 words
The invention as defined in claim 1 including: an intermediate sheathing disposed between the first and second sheathing, said intermediate sheathing being permeable to the liquid to be detected and which prevents the material of the first sheathing from penetrating the second sheathing.
Claim 10
Dependent Claim
15 words
The invention as defined in claim 8 wherein said intermediate layer is a fibrous web.
Claim 11
Dependent Claim
15 words
The invention as defined in claim 1 wherein said first sheathing is a silicone material.
Claim 12
Dependent Claim
15 words
The invention as defined in claim 1 wherein said first sheathing is a cellulose material.
Claim 13
Dependent Claim
31 words
The invention as defined in claim 1 including: a protective sheathing surrounding said second sheathing, said protective sheathing being of a material which is dissolvable by the liquid to be detected.
References Cited (Backward Citations)
JPS5630622A
Cited
JPS5648533A
Cited
EP0086024A1
Cited
JPS59105533A
Cited
US4570477A
Cited
US4710353A
Cited
US4926165A
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |