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US4107018A
Expired / Lapsed
US
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Solid electrolyte gas sensor having a protective bonding layer
Assignee: Bendix Corp
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Filing: 1977-09-01
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Granted: 1978-08-15
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Expires: 1997-09-01
Abstract
Abstract A solid electrolyte sensor for sensing oxygen in exhaust gases having a solid electrolyte body of a thimble-like design with an inner conductor thereon and a nonreactive but compatible bonding layer of magnesium or calcium oxide over the outer surface of the electrolyte body and a conductive catalyst layer superimposed on the bonding layer.
Inventors
- 👤 James Daniel Bode
- 👤 Seong Kwan Rhee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:24
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; G01N27/4077
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
In a solid electrolyte sensor element for sensing oxygen wherein the element comprises a solid electrolyte body for transferring oxygen ions, the body having an inner surface with conductive means thereon, the improvement comprising a nonreactive but compatible bonding layer of an oxide of an alkaline earth metal selected from the group consisting of magnesium and calcium or a mixture thereof, on the outer surface of said solid electrolyte body and a conductive catalyst layer superimposed on said bonding layer.
Claim 2
Dependent Claim
80 words
In a solid electrolyte sensor element for sensing oxygen wherein the element comprises a solid electrolyte body for transferring oxygen ions, the body having an inner surface with conductive means thereon, the improvement comprising a nonreactive but compatible bonding layer of an oxide of an alkaline earth metal selected from the group consisting of magnesium and calcium or a mixture thereof, on the outer surface of said solid electrolyte body and a conductive catalyst layer superimposed on said bonding layer.
Claim 3
Dependent Claim
21 words
In a solid electrolyte sensor element as defined in claim 1, the improvement wherein said solid electrolyte body comprises zirconium dioxide.
Claim 4
Dependent Claim
24 words
In a solid electrolyte sensor element as defined in claim 1, the improvement wherein said oxide of an alkaline earth metal is magnesium oxide.
Claim 5
Dependent Claim
20 words
In a solid electrolyte sensor element as defined in claim 3, the improvement wherein said conductive catalyst layer comprises platinum.
Claim 6
Dependent Claim
78 words
In a method of forming a solid electrolyte sensor element for sensing oxygen having a solid electrolyte body with an inner surface having a conductive means thereon, the improvement comprising: applying to the outer surface of said solid electrolyte body a nonreactive but compatible layer of an oxide of an alkaline earth metal selected from the group consisting of magnesium and calcium oxide or a mixture thereof; and applying a conductive catalyst layer over said layer of oxide.
Claim 7
Dependent Claim
78 words
In a method of forming a solid electrolyte sensor element for sensing oxygen having a solid electrolyte body with an inner surface having a conductive means thereon, the improvement comprising: applying to the outer surface of said solid electrolyte body a nonreactive but compatible layer of an oxide of an alkaline earth metal selected from the group consisting of magnesium and calcium oxide or a mixture thereof; and applying a conductive catalyst layer over said layer of oxide.
Claim 8
Dependent Claim
51 words
In the method of forming a solid electrolyte sensor element as defined in claim 5, the improvement wherein said alkaline earth metal oxide is applied to said electrolyte body as a decomposable alkaline earth metal compound and heating said alkaline earth metal compound to decompose the same and form said oxide.
Claim 9
Dependent Claim
24 words
In the method of forming a solid electrolyte sensor element as defined in claim 5, the improvement wherein said conductive catalyst layer comprises platinum.
Claim 10
Dependent Claim
43 words
In the method of forming a solid electrolyte sensor element as defined in claim 7, the improvement comprising applying platinum particles to said alkaline earth metal oxide layer and heating the same to firing temperature and applying a subsequent layer of platinum thereover.
Claim 11
Dependent Claim
31 words
In the method of forming a solid electrolyte sensor element as defined in claim 5, the improvement comprising applying said alkaline earth metal oxide to said electrolyte body by direct sputtering.
Claim 12
Dependent Claim
31 words
In the method of forming a solid electrolyte sensor element as defined in claim 5, the improvement comprising applying said alkaline earth metal oxide to said electrolyte body by reactive sputtering.
References Cited (Backward Citations)
FR1545356A
Cited
US3503809A
Cited
US3645875A
Cited
US4021326A
Cited
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Cited
US3989614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |