Patent US3708412A successfully refreshed from Google Patents.
US3708412A
Expired / Lapsed
US
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Electrochemical cell with composite electrode-membrane
Assignee: Honeywell Inc
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Filing: 1971-10-13
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Granted: 1973-01-02
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Expires: 1991-10-13
Abstract
Abstract A composite laminated electrode diffusion medium for use with electrochemical cells, particularly of the type used to detect the proportionate amount of a gas in a fluid medium, includes an intermediate barrier membrane member of a gas permeable, nonconducting material flanked in sandwich fashion by gas permeable, non-conducting carrier membrane layers, wherein the outer layer carries a metal screen blocking member which reduces the amount of sample gas diffusing through the membrane and the inner layer carries the sensing electrode.
Inventors
- 👤 H Lofgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:24
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
An electrochemical cell as claimed in claim 1, wherein said non-conducting membrane members are plastic.
Claim 2
Dependent Claim
30 words
An electrochemical cell as claimed in claim 2, wherein said member comprising said central zone has a higher melting point than said non-conductive members of said outer and inner zones.
Claim 3
Dependent Claim
41 words
An electrochemical cell as claimed in claim 1, wherein said non-conducting membrane member of said outer zone and said non-conducting membrane member of said inner zone are fluorinated ethylene-propylene and said non-conductive membrane member in said central zone is a polytetrafluoroethylene.
Claim 4
Dependent Claim
14 words
An electrochemical cell as claimed in claim 1, wherein said blocking member is metal.
Claim 5
Dependent Claim
22 words
An electrochemical cell as claimed in claim 5, wherein said metal blocking member is in the form of a uniformly perforated plate.
Claim 6
Dependent Claim
21 words
An electrochemical cell as claimed in claim 5, wherein said metal blocking member is in the form of a uniform screen.
Claim 7
Dependent Claim
31 words
An electrochemical cell as claimed in claim 7, wherein said screen is electroformed gold having from 200 to 500 lines per inch and a thickness of from 0.0003 to 0.0006 inch.
Claim 8
Dependent Claim
17 words
An electrochemical cell as claimed in claim 7, wherein said screen comprises about 20 percent open area.
Claim 9
Dependent Claim
32 words
An electrochemical cell as claimed in claim 1, wherein the measuring electrode member embedded in said membrane member of said inner zone is a noble metal in the form of a mesh.
References Cited (Backward Citations)
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Cited
US3001918A
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US3410778A
Cited
US3503861A
Cited
US3574078A
Cited
US3655546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |