US4528543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture sensitive resistive element
Assignee: Sharp Corp
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Filing: 1984-03-30
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Granted: 1985-07-09
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Expires: 2004-03-30
Abstract
Abstract A moisture sensitive resistive element includes a substrate made of an electrically non-conductive material, first and second electrodes deposited on the substrate in a spaced relation to each other, and a moisture sensitive film deposited on the substrate covering both the first and second electrodes. The moisture sensitive film is formed by a material given by a formula: [--CH(C 6 H 4 SO 3 X)--CH 2 --] n wherein X is any one of a hydrogen atom, metal atom, ammonium, urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine, or formed by a mixture of the above material with a hydrophilic polymer which is any one selected from a group consisting of polyvinyl alcohol, methyl cellulose and polyamide resin.
Inventors
- 👤 Shuji Miyoshi
- 👤 Takashi Sugihara
- 👤 Masaya Hijikigawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24926; Y10T428/31504
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
The method of producing a moisture sensitive electrically resistive element capable of detecting and measuring moisture variations and content under ambient conditions ranging from 0 to 100% relative humidity which comprises: providing a substrate made of electrically non-conductive material; depositing first and second electrodes on said substrate in a spaced relationship to each other; and depositing a moisture sensitive film comprising a polymeric material having a formula: [--CH(C.sub.6 H.sub.4 SO.sub.3 X)--CH.sub.2 --].sub.n wherein X is any one of a hydrogen atom, metal atom, ammonium, urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine wherein n is qreater than 50; such that said resulting electrically resistive element has quick response to said broad humidity change to vary its internal ohmic resistance.
Claim 2
Independent Claim
116 words
The method of producing a moisture sensitive electrically resistive element capable of detecting and measuring moisture variations and content under ambient conditions ranging from 0 to 100% relative humidity which comprises: providing a substrate made of electrically non-conductive material; depositing first and second electrodes on said substrate in a spaced relationship to each other; and depositing a moisture sensitive film comprising a polymeric material having a formula: [--CH(C.sub.6 H.sub.4 SO.sub.3 X)--CH.sub.2 --].sub.n wherein X is any one of a hydrogen atom, metal atom, ammonium, urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine wherein n is qreater than 50; such that said resulting electrically resistive element has quick response to said broad humidity change to vary its internal ohmic resistance.
Claim 3
Independent Claim
140 words
A method of detecting and measuring moisture variations and content under ambient conditions utilizing a highly moisture sensitive electrically resistance element which comprises: providing a highly stable moisture sensitive electrically resistive element capable of detecting and measuring moisture variations and content under ambient conditions ranging from 0 to 100% relative humidity comprising a substrate made of electrically non-conductive material, first and second electrodes superimposed on said substrate in a spaced relationship to each other and a moisture sensitive film comprising a polymeric material having a formula: [--CH(C.sub.6 H.sub.4 SO.sub.3 X)--CH.sub.2 --].sub.n wherein X is any one of a hydrogen atom, metal atom, ammonium urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine wherein n is greater than 50; and introducing said element into a moisture variable environment, said electrically resistive element responding quickly to said broad humidity range to vary its internal ohmic resistance.
Claim 4
Independent Claim
140 words
A method of detecting and measuring moisture variations and content under ambient conditions utilizing a highly moisture sensitive electrically resistance element which comprises: providing a highly stable moisture sensitive electrically resistive element capable of detecting and measuring moisture variations and content under ambient conditions ranging from 0 to 100% relative humidity comprising a substrate made of electrically non-conductive material, first and second electrodes superimposed on said substrate in a spaced relationship to each other and a moisture sensitive film comprising a polymeric material having a formula: [--CH(C.sub.6 H.sub.4 SO.sub.3 X)--CH.sub.2 --].sub.n wherein X is any one of a hydrogen atom, metal atom, ammonium urea, triethylenediamine, tetramethyleneguanidine and hexamethylenediamine wherein n is greater than 50; and introducing said element into a moisture variable environment, said electrically resistive element responding quickly to said broad humidity range to vary its internal ohmic resistance.
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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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |