US4942364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture and dew-detection sensor
Assignee: Asahi Kasei Corp
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Filing: 1989-02-14
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Granted: 1990-07-17
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Expires: 2009-02-14
Abstract
Abstract A moisture and dew-detection sensor comprises a fabric and a moisture sensing resistive substance adhered in a substantially continued and dispersed state to the fabric, and a plurality of fine voids are formed in the moisture and dew-detection sensor. A response time and an accuracy of the sensor in accordance with the present invention are superior due to the existence of the plurality of voids.
Inventors
- 👤 Jun-ichi Nishijima
- 👤 Minoru Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:46
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A moisture and dew-detection sensor comprised of a nonwoven fabric and a moisture sensing resistive substance adhered in a substantially continuous and dispersed state to said nonwoven fabric, said moisture sensing resistive substance including a mixture of a nonionic hygroscopic high polymer and a conductive particle, and a plurality of continuous fine voids formed therein.
Claim 2
Dependent Claim
55 words
A moisture and dew-detection sensor comprised of a nonwoven fabric and a moisture sensing resistive substance adhered in a substantially continuous and dispersed state to said nonwoven fabric, said moisture sensing resistive substance including a mixture of a nonionic hygroscopic high polymer and a conductive particle, and a plurality of continuous fine voids formed therein.
Claim 3
Dependent Claim
17 words
A moisture and dew-detection sensor according to claim 1, wherein said conductive particle is a carbon black.
Claim 4
Dependent Claim
28 words
A moisture and dew-detection sensor according to claim 1, wherein said nonwoven fabric is composed of an extra fine fiber having a diameter of 30 μm or less.
Claim 5
Dependent Claim
29 words
A moisture and dew-detection sensor according to claim 1, wherein a pick up of said moisture sensing resistive substance against said fabric is between 10% o.w.f. and 100% o.w.f.
Claim 6
Dependent Claim
50 words
A moisture and dew-detection sensor according to claim 1, wherein said moisture sensing resistive substance is applied from a side of said fabric, so that a quantity of the moisture sensing resistive substance on said side of the fabric is greater than that on an opposite side of the fabric.
Claim 7
Dependent Claim
20 words
A moisture and dew-detection sensor according claim 1, wherein a VOID rate of said fabric is between 10% and 95%.
Claim 8
Dependent Claim
32 words
A moisture and dew-detection sensor according to claim 1, including electrodes attached to at least two portions of said sensor and means for mounting said sensor to a substance to be detected.
Claim 9
Dependent Claim
39 words
A moisture and dew-detection sensor device according to claim 7, wherein said sensor mounting means is a plate-like member having a good heat conductivity and adhered through an insulating layer to said sensor and provided with said electrodes thereon.
Claim 10
Dependent Claim
29 words
A moisture and dew-detection sensor device according to claim 8, wherein said plate-like member having a good heat conductivity is a printed circuit board made of a metal plate.
Claim 11
Dependent Claim
31 words
A moisture and dew-detection sensor according to claim 7, including circuit means for detecting a change of a resistance value of said sensor and outputting said change as an electrical signal.
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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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |