US3883408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace atmosphere oxygen analysis apparatus
Assignee: Inland Steel Co
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Filing: 1974-01-28
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Granted: 1975-05-13
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Expires: 1994-01-28
Abstract
Abstract Galvanic cell for measuring oxygen potential in furnace atmospheres uses a tubular solid electrolyte probe containing a mixture of iron and iron oxide as a standard electrode. The interior of the cell is hermetically sealed by a layer of finely divided alumina, while shorting between conductors attached to the exterior and interior of the probe is inhibited by a bed of refractory sand in which one conductor is embedded.
Inventors
- 👤 Yong-Wu Kim
- 👤 John P Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:04
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; G01N27/4076
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
AN OXYGEN-ION CONDUCTING GALVANIC CELL COMPRISING: AN ELONGATED, HOLLOW PROBE HAVING ONE OPEN END AND HAVING AN EXTERIOR SURFACE AND AN INTERIOR SURFACE, SAID PROBE BEING MADE OF AN OXYGEN-ION CONDUCTING SOLID ELECTROLYTE, A MIXTURE OF FINELY DIVIDED IRON AND A FINELY DIVIDED OXIDE THEREOF, SAID MIXTUE BEING COMPACTED IN SAID HOLLOW PROBE, A HERMETIC SEAL ASOCIATED WITH SAID OPEN END COMPRISING A FINELY DIVIDED, ELECTRICALLY NONCONDUCTING INERT REFRACTORY SOLID MATERIAL CONTAINED WITHIN SAID PROBE ADJACENT SAID MIXTURE, MECHANICAL SEAL MEANS FOR HOLDING SAID HERMEITC SEAL IN POSITION ADJACENT SAID MIXTURE, A FIRST ELECTRICAL CONDUCTOR MAKING ELECTRICAL CONTACT WITH THE EXTERIOR SURFACE OF SAID PROBE,
Claim 2
Dependent Claim
105 words
AN OXYGEN-ION CONDUCTING GALVANIC CELL COMPRISING: AN ELONGATED, HOLLOW PROBE HAVING ONE OPEN END AND HAVING AN EXTERIOR SURFACE AND AN INTERIOR SURFACE, SAID PROBE BEING MADE OF AN OXYGEN-ION CONDUCTING SOLID ELECTROLYTE, A MIXTURE OF FINELY DIVIDED IRON AND A FINELY DIVIDED OXIDE THEREOF, SAID MIXTUE BEING COMPACTED IN SAID HOLLOW PROBE, A HERMETIC SEAL ASOCIATED WITH SAID OPEN END COMPRISING A FINELY DIVIDED, ELECTRICALLY NONCONDUCTING INERT REFRACTORY SOLID MATERIAL CONTAINED WITHIN SAID PROBE ADJACENT SAID MIXTURE, MECHANICAL SEAL MEANS FOR HOLDING SAID HERMEITC SEAL IN POSITION ADJACENT SAID MIXTURE, A FIRST ELECTRICAL CONDUCTOR MAKING ELECTRICAL CONTACT WITH THE EXTERIOR SURFACE OF SAID PROBE,
Claim 3
Dependent Claim
33 words
The cell of claim 1 wherein said solid electrolyte is selected from the group consisting of zirconia stabilized with calcia; zirconia stabilized with yttria; thoria stabilized with calcia; and thoria stabilized with yttria.
Claim 4
Dependent Claim
13 words
The cell of claim 1 wherein said hermetic seal comprises finely divided alumina.
Claim 5
Dependent Claim
30 words
The cell of claim 1 which includes means attached to said first and second conductors for measuring the electromotive force developed between the interior and exterior surfaces of said probe.
Claim 6
Dependent Claim
11 words
The cell of claim 1 wherein said refractory sand is zirconia.
References Cited (Backward Citations)
US3481855A
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US3576730A
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US3619381A
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US3758397A
Cited
US3767469A
Cited
US3772177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |