US4638286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactive gas sensor
Assignee: Internorth Inc
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Filing: 1985-03-26
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Granted: 1987-01-20
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Expires: 2005-03-26
Abstract
Abstract A reactive gas sensor which utilizes an electrically conductive polymer composite which comprises an inner layer of an electrically conductive polymer, intermediate layers of a polymer which exhibits a low degree of gas permeability, and protective outer layers of a polymer which exhibits a low degree of moisture permeability. The preferred polymers for the intermediate layers are ethylene vinyl alcohol copolymers and polyvinylidene chloride. The sensor also includes means for measuring the resistance of the electrically conductive polymer.
Inventors
- 👤 Leo F. Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125; G01N27/126; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A reactive gas sensor which comprises: (a) an electrically conductive polymer composite comprising: (i) an inner layer of an electrically conductive polymer selected from the group consisting of polyacetylene, poly(phenylene), poly(phenylene sulfide) and poly(phenylene oxide), (ii) intermediate layers of a polymer which exhibits a low degree of gas permeability, and (iii) protective outer layers of a polymer which exhibits a low degree of moisture permeability, and (b) means for measuring the resistance of the electrically conductive polymer.
Claim 2
Dependent Claim
77 words
A reactive gas sensor which comprises: (a) an electrically conductive polymer composite comprising: (i) an inner layer of an electrically conductive polymer selected from the group consisting of polyacetylene, poly(phenylene), poly(phenylene sulfide) and poly(phenylene oxide), (ii) intermediate layers of a polymer which exhibits a low degree of gas permeability, and (iii) protective outer layers of a polymer which exhibits a low degree of moisture permeability, and (b) means for measuring the resistance of the electrically conductive polymer.
Claim 3
Dependent Claim
32 words
The sensor of claim 1 wherein the polymer which forms the intermediate layers is selected from the group consisting of ethylene vinyl alcohol copolymers, polyvinylidene chloride, polyethylene terephthalate, polyformaldehyde and polyvinyl fluoride.
Claim 4
Dependent Claim
12 words
The sensor of claim 2 wherein the electrically conducting polymer is polyacetylene.
Claim 5
Dependent Claim
27 words
The sensor of claim 2 wherein the polymer which forms the protective outer layers is selected from the group consisting of low density polyethylene, polypropylene and polytetrafluoroethylene.
Claim 6
Dependent Claim
59 words
An electrically conductive polymer composite which comprises: (a) an inner layer of an electrically conductive polymer selected from the group consisting of polyacetylene, poly(phenylene), poly(phenylene sulfide) and poly(phenylene oxide), (b) intermediate layers of a polymer which exhibits a low degree of gas permeability, and (c) protective outer layers of a polymer which exhibits a low degree of moisture permeability.
Claim 7
Dependent Claim
59 words
An electrically conductive polymer composite which comprises: (a) an inner layer of an electrically conductive polymer selected from the group consisting of polyacetylene, poly(phenylene), poly(phenylene sulfide) and poly(phenylene oxide), (b) intermediate layers of a polymer which exhibits a low degree of gas permeability, and (c) protective outer layers of a polymer which exhibits a low degree of moisture permeability.
Claim 8
Dependent Claim
32 words
The composite of claim 5 wherein the polymer which forms the intermediate layers is selected from the group consisting of ethylene vinyl alcohol copolymers, polyvinylidene chloride, polyethylene terephthalate, polyformaldehyde and polyvinyl fluoride.
Claim 9
Dependent Claim
12 words
The composite of claim 6 wherein the electrically conducting polymer is polyacetylene.
Claim 10
Dependent Claim
27 words
The composite of claim 6 wherein the polymer which forms the protective outer layers is selected from the group consisting of low density polyethylene, polypropylene and polytetrafluoroethylene.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |