US3848218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidity sensing element
Assignee: Individual
•
Filing: 1973-09-07
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Granted: 1974-11-12
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Expires: 1993-09-07
Abstract
Abstract A humidity sensing element has a humidity sensitive film which has finely divided conductive particles dispersed in a resin consisting essentially of a reaction product of a chlorine containing polymer and a polyamide resin. Two electrodes are applied to the humidity sensitive film. The electrical resistance of the humidity sensing element increases as the humidity of the atmosphere in which humidity sensing element is placed increases. The humidity sensing element has high stability at high humidity, high sensitivity over a given humidity range and can be operated with DC in a high humidity range.
Inventors
- 👤 T Wakabayashi
- 👤 K Sugihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
A HUMIDITY SENSING ELEMENT COMPRISING A HUMIDITY SENSITIVE FILM WHICH HAS FINELY DIVIDED CONDUCTIVE PARTICLES DISPERSED IN A RESIN CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF A CHLORINE CONTAINING POLYMER AND A POLYAMIDE RESIN, AND TWO ELECTRODES APPLIED TO SAID HUMIDITY SENSITIVE FILM.
Claim 2
Dependent Claim
43 words
A HUMIDITY SENSING ELEMENT COMPRISING A HUMIDITY SENSITIVE FILM WHICH HAS FINELY DIVIDED CONDUCTIVE PARTICLES DISPERSED IN A RESIN CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF A CHLORINE CONTAINING POLYMER AND A POLYAMIDE RESIN, AND TWO ELECTRODES APPLIED TO SAID HUMIDITY SENSITIVE FILM.
Claim 3
Dependent Claim
32 words
A humidity sensing element according to claim 1, wherein said chlorine containing polymer comprises one member selected from the group consisting of chlorinated diene polymer, chlorine containing vinyl polymer and chloro-substituted polyolefine.
Claim 4
Dependent Claim
33 words
A humidity sensing element according to claim 1, wherein said polyamide resin comprises a condensation product of an alkylene polYamine and a polycarboxylic acid which is obtained by thermal polymerization of fatty acid.
Claim 5
Dependent Claim
18 words
A humidity sensing element according to claim 1, wherein said chlorine containing polymer comprises a chlorinated natural rubber.
Claim 6
Dependent Claim
40 words
A humidity sensing element according to claim 1, wherein the reactive proportions of said chlorine containing polymer and said polyamide resin is 70 to 10 weight % of chlorine containing polymer and 30 to 90 weight % of polyamide resin.
Claim 7
Dependent Claim
31 words
A humidity sensing element according to claim 1, wherein said finely divided conductive particles consist essentially of a material selected from the group consisting of carbon black, graphite, silver and gold.
Claim 8
Dependent Claim
20 words
A humidity sensing element according to claim 1, which further has a protective cover on the humidity sensitive film thereof.
Claim 9
Dependent Claim
20 words
A humidity sensing element according to claim 7, wherein said protective cover is a thin film of moisture absorptive resin.
Claim 10
Dependent Claim
20 words
A humidity sensing element according to claim 1, wherein said polyamide resin has an amine value of more than 100.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |