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Patent US3983527A successfully refreshed from Google Patents.
US3983527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidity-sensitive sensor
Assignee: Nippon Sheet Glass Co Ltd
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Filing: 1974-08-12
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Granted: 1976-09-28
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Expires: 1994-08-12
Abstract
Abstract A humidity-sensitive sensor, especially useful on the window of an automobile with the sensor on the inside surface of the glass. The sensor has a pair of spaced electrodes and a humidity-sensitive coating composed of a hydroscopic resin extending over the pair of electrodes. The resin can be an acrylate resin or a methacrylate resin, and preferably is a resin which has a volume change of at least 10% in response to a 50% change in humidity. Dispersed in the resin are electrically conductive particles, preferably in an amount of from 20 to 60% by volume of the amount of resin. The sensor, prior to its use in an operating device, is preferably exposed to a high humidity condition and a low humidity condition at least thirty times in order to stabilize it.
Inventors
- 👤 Nobuyoshi Ohsato
- 👤 Kenzo Sono
- 👤 Keihachiro Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121; B; B60; B60S; B60S1/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A humidity-sensitive sensor comprising: an electrically non-conductive base plate; a pair of spaced electrodes fixed on said base plate; a humidity-sensitive coating composed of a hygroscopic resin having dispersed therein electrically conductive particles and extending over said pair of electrodes; and an adhesive layer bonding said humidity-sensitive coating to said base plate, said adhesive layer being composed of an adhesive having dispersed therein electrically conductive particles and electrically connecting each of said electrodes to said humidity-sensitive coating while electrically insulating said electrodes from each other.
Claim 2
Dependent Claim
85 words
A humidity-sensitive sensor comprising: an electrically non-conductive base plate; a pair of spaced electrodes fixed on said base plate; a humidity-sensitive coating composed of a hygroscopic resin having dispersed therein electrically conductive particles and extending over said pair of electrodes; and an adhesive layer bonding said humidity-sensitive coating to said base plate, said adhesive layer being composed of an adhesive having dispersed therein electrically conductive particles and electrically connecting each of said electrodes to said humidity-sensitive coating while electrically insulating said electrodes from each other.
Claim 3
Dependent Claim
10 words
The sensor of claim 1 wherein said adhesive is non-hygroscopic.
Claim 4
Dependent Claim
28 words
The sensor of claim 2 wherein the volume of the electrically conductive particles dispersed in the hygroscopic resin is 20 to 60% of that of the hygroscopic resin.
Claim 5
Dependent Claim
23 words
The sensor of claim 3 wherein said hygroscopic resin is a resin taken from the group consisting of acrylate resins and methacrylate resins.
Claim 6
Dependent Claim
17 words
The sensor of claim 4 wherein said resin is a polymer of a hydroxy lower alkyl acrylate.
Claim 7
Dependent Claim
14 words
The sensor of claim 4 wherein said resin is a hydroxy lower alkyl methacrylate.
Claim 8
Dependent Claim
14 words
The sensor of claim 4 wherein said resin is a homopolymer of 2-hydroxyethyl methacrylate.
Claim 9
Dependent Claim
14 words
The sensor of claim 4 wherein said resin is a copolymer of 2-hydroxyethyl methacrylate.
Claim 10
Dependent Claim
15 words
The sensor of claim 3 wherein said hygroscopic resin is cross-linked with a cross-linking agent.
Claim 11
Dependent Claim
33 words
The sensor of claim 3 wherein at least one of said pair of electrodes has a lead of a metal selected from the group consisting of gold, platinum, palladium, rhodium and alloys thereof.
Claim 12
Dependent Claim
29 words
The sensor of claim 3 wherein said base plate is a window glass of an automobile, and the humidity-sensitive sensor is on the inside surface of said window glass.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |