US4961064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil leakage sensor
Assignee: W.L. Gore and Associates Inc
•
Filing: 1989-11-13
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Granted: 1990-10-02
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Expires: 2009-11-13
Abstract
Abstract An oil-leakage sensor formed from a porous water-repellent resin admixed with fine electrically conductive carbon particles coated with a water-repelling layer.
Inventors
- 👤 Sachio Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125; G01N27/126; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; G01M3/045; G01M3/16; G01M3/165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
An oil-leakage sensor comprising: (a) a resistor formed of water-repellent porous resin having admixed fine electrically conductive carbon particles, said carbon particles being covered with an oil-penetrable water-repellent coating layer; and (b) a covering material surrounding said resistor which comprises a water-repellent porous resin.
Claim 2
Dependent Claim
44 words
An oil-leakage sensor comprising: (a) a resistor formed of water-repellent porous resin having admixed fine electrically conductive carbon particles, said carbon particles being covered with an oil-penetrable water-repellent coating layer; and (b) a covering material surrounding said resistor which comprises a water-repellent porous resin.
Claim 3
Dependent Claim
14 words
A sensor of claim 1, wherein the water-repellent porous resin comprises porous expanded polytetrafluoroethylene.
Claim 4
Dependent Claim
13 words
A sensor of claim 2, wherein the water-repellent coating layer comprises a fluororesin.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |