Patent US4046661A successfully refreshed from Google Patents.
US4046661A
Expired / Lapsed
US
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Ceramic oxygen probe
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1972-04-14
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Granted: 1977-09-06
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Expires: 1992-04-14
Abstract
Abstract A probe for use in measuring the oxygen concentration of fluids comprising a disc or pellet of solid electrolyte located at or near the end of a ceramic tube, and an electrode within the tube contacting the inner face of the pellet, characterized in that the ceramic tube is constructed of alumina, mullite or an aluminous porcelain containing at least 4 per cent by weight of free alumina and not more than 40 per cent by weight silica, and the electrolyte is sealed to the tube by a fusion weld.
Inventors
- 👤 Robert Kenneth Stringer
- 👤 Kenneth Alan Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/411; G01N27/4112
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A probe for use in measuring the oxygen concentration of fluids comprising: a ceramic tube constructed of alumina, mullite, or an aluminous porcelain containing at least 56% by weight alumina and in which at least 7% of the alumina content is free alumina and not more than 40% by weight silica; a pellet of solid electrolyte located in said ceramic tube in proximity to the end of said ceramic tube, and sealed to the tube by a fusion weld, the outer diameter of said pellet being substantially the same as the inner diameter of said tube; a eutectic mixture at the electrolyte/tube interface; and an electrode within said tube contacting the inner face of said pellet.
Claim 2
Dependent Claim
116 words
A probe for use in measuring the oxygen concentration of fluids comprising: a ceramic tube constructed of alumina, mullite, or an aluminous porcelain containing at least 56% by weight alumina and in which at least 7% of the alumina content is free alumina and not more than 40% by weight silica; a pellet of solid electrolyte located in said ceramic tube in proximity to the end of said ceramic tube, and sealed to the tube by a fusion weld, the outer diameter of said pellet being substantially the same as the inner diameter of said tube; a eutectic mixture at the electrolyte/tube interface; and an electrode within said tube contacting the inner face of said pellet.
Claim 3
Dependent Claim
25 words
A probe as defined in claim 1, in which the electrolyte is doped thoria, stabilized zirconia, partially stabilized zirconia, stabilized hafnia, or partially stabilized hafnia.
Claim 4
Dependent Claim
19 words
A probe as defined in claim 1 including a front electrode contacting the outer face of the electrolyte pellet.
References Cited (Backward Citations)
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GB1191222A
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US3619381A
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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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |