US4520341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture responsive element with crosslinked organic membrane and protective layering
Assignee: Sharp Corp
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Filing: 1982-12-02
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Granted: 1985-05-28
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Expires: 2002-12-02
Abstract
Abstract A moisture responsive element comprises a moisture responsive organic membrane in contact with electrically conductive members, in which the organic membrane consists essentially of a crosslinked organic polymer having a hydrophilic group. The element has excellent water and moisture resistance, long-term stability and excellent humidity response over a range of humidity from 0 to 100 percent. The moisture responsive element includes a protective layer of cellulose acetate and/or polyvinyl acetate.
Inventors
- 👤 Shuji Miyoshi
- 👤 Takashi Sugihara
- 👤 Akihito Jinda
- 👤 Masaya Hijikigawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:32
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A moisture responsive element consisting essentially of: an electrically non-conductive base plate; a pair of spaced electrodes fixed on said base plate; a moisture responsive organic membrane comprising an organic monomer and crosslinking agent consisting essentially of material selected from the group consisting of crosslinked polystyrene sulfonic acid and salt of polystyrene sulfonic acid extending over said pair of electrodes; and a protective layer consisting essentially of material selected from the group consisting of cellulose acetate and polyvinyl acetate coated on said moisture responsive organic membrane.
Claim 2
Dependent Claim
86 words
A moisture responsive element consisting essentially of: an electrically non-conductive base plate; a pair of spaced electrodes fixed on said base plate; a moisture responsive organic membrane comprising an organic monomer and crosslinking agent consisting essentially of material selected from the group consisting of crosslinked polystyrene sulfonic acid and salt of polystyrene sulfonic acid extending over said pair of electrodes; and a protective layer consisting essentially of material selected from the group consisting of cellulose acetate and polyvinyl acetate coated on said moisture responsive organic membrane.
Claim 3
Dependent Claim
26 words
The moisture responsive element of claim 1, in which the crosslinking agent is selected from the group consisting of N,N'-methylene-bis-acrylamide, divinylbenzene, hexatriene, divinyl sulfone, and diallylphthalete.
Claim 4
Dependent Claim
23 words
The moisture responsive element of claim 1, in which a molar ratio of organic monomer to crosslinking agent is from 0.01 to 0.2.
Claim 5
Dependent Claim
28 words
The moisture responsive element of claim 1, in which said salt is selected from the group consisting of sodium, lithium, ammonium, urea, triethylene-diamine, hexamethylene-tetramine and tetramethyl guanidine salt.
Claim 6
Dependent Claim
21 words
The moisture responsive element of claim 1, in which the moisture responsive organic membrane further comprises a water soluble non-crosslinked polymer.
Claim 7
Dependent Claim
25 words
The moisture responsive element of claim 5, in which the water soluble polymer is selected from the group consisting of polyvinyl alcohol and methyl cellulose.
Claim 8
Dependent Claim
21 words
The moisture responsive element of claim 1, in which the thickness of the protective layer is from 0.5 to 10 μm.
References Cited (Backward Citations)
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Cited
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US3848218A
Cited
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Cited
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Cited
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |