Patent US4843305A successfully refreshed from Google Patents.
US4843305A
Expired / Lapsed
US
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Spacer-separated liquid leakage sensor
Assignee: W.L. Gore and Associates Inc
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Filing: 1988-09-02
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Granted: 1989-06-27
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Expires: 2008-09-02
Abstract
Abstract A liquid leakage sensor having spaced apart pairs of insulated conductors on oppositge sides of a strip of insulation and aperture access from one side of the strip to conductors on the other side. Can be wrapped about small pipes or objects without conductor breakthrough of insulation and electrical contact with pipe.
Inventors
- 👤 Juji Akiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:04
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/16; G01M3/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A liquid leakage sensor comprising: (a) a strip of insulative material; (b) a spaced apart pair of insulated spacers attached to one side of said strip, (c) a spaced apart pair of insulated conductors attached to the opposite side of said strip, the position of said pair of conductors lying generally between and nearer the center of said strip than said pair of spacers; and (d) a series of regularly spaced apertures through said strip of insulation between each of said conductors and the opposite surface of said strip.
Claim 2
Dependent Claim
89 words
A liquid leakage sensor comprising: (a) a strip of insulative material; (b) a spaced apart pair of insulated spacers attached to one side of said strip, (c) a spaced apart pair of insulated conductors attached to the opposite side of said strip, the position of said pair of conductors lying generally between and nearer the center of said strip than said pair of spacers; and (d) a series of regularly spaced apertures through said strip of insulation between each of said conductors and the opposite surface of said strip.
Claim 3
Dependent Claim
23 words
A sensor of claim 1 wherein said strip of insulative material and the insulation on said spacers and conductors is porous expanded polytetrafluoroethylene.
Claim 4
Dependent Claim
13 words
A sensor of claim 1 wherein said spacers consist essentially of conductive metal.
Claim 5
Dependent Claim
13 words
A sensor of claim 1 wherein said spacers consist essentially of non-conductive material.
Claim 6
Dependent Claim
12 words
A sensor of claim 4 wherein said non-conductive material is a plastic.
References Cited (Backward Citations)
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Cited
US4288653A
Cited
US4319232A
Cited
US4386231A
Cited
US4598277A
Cited
US4677371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |