US4209378A
Expired / Lapsed
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Oxygen sensing element
Assignee: Toyota Motor Corp
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Filing: 1979-05-04
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Granted: 1980-06-24
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Expires: 1999-05-04
Abstract
Abstract Low temperature operability of an oxygen sensing element, which comprises a solid electrolyte member composed of sintered material, and a means for providing a reference oxygen partial pressure, composed of a sintered product of a finely divided metal or metal-metal oxide mixture powder and being completely embedded within the solid electrolyte member, is improved by the incorporation of from 0.5 to 10% by weight, based on the total weight of the sintered product, of a finely divided platinum group metal powder in the sintered product of the reference oxygen partial pressure-providing means.
Inventors
- 👤 Hiroshi Schinohara
- 👤 Yasuhiro Otsuka
- 👤 Shinichi Matsumoto
- 👤 Toshinobu Furutani
- 👤 Hiroshi Wakizaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; G01N27/4076; H; H01; H01M; H01M12/00; H01M12/04; H01M12/06; H01M8/00; H01M8/10; H01M8/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
An improvement in an oxygen sensing element which comprises a solid electrolyte member composed of sintered material, and a means for providing a reference oxygen partial pressure, composed of a sintered product of a finely divided metal or metal-metal oxide powder, said means being completely embedded within the solid electrolyte member and having a lead-out wire connected thereto, and said solid electrolyte member having an electrode or electrodes mounted on the exterior surface thereof, said improvement comprising said sintered product having dispersed therein a finely divided platinum group metal powder in an amount of from 0.5 to 10% by weight, based on the total weight of the sintered product.
Claim 2
Dependent Claim
109 words
An improvement in an oxygen sensing element which comprises a solid electrolyte member composed of sintered material, and a means for providing a reference oxygen partial pressure, composed of a sintered product of a finely divided metal or metal-metal oxide powder, said means being completely embedded within the solid electrolyte member and having a lead-out wire connected thereto, and said solid electrolyte member having an electrode or electrodes mounted on the exterior surface thereof, said improvement comprising said sintered product having dispersed therein a finely divided platinum group metal powder in an amount of from 0.5 to 10% by weight, based on the total weight of the sintered product.
Claim 3
Dependent Claim
29 words
An oxygen sensing element according to claim 1 wherein the platinum group metal is at least one metal selected from the group consisting of platinum, rhodium, palladium and iridium.
Claim 4
Dependent Claim
39 words
An oxygen sensing element according to claim 1 wherein said sintered product has dispersed therein a finely divided platinum powder in an amount of from 1.0 to 5.0% by weight based on the total weight of the sintered product.
Claim 5
Dependent Claim
52 words
An oxygen sensing element according to claim 1 wherein said sintered product has dispersed therein a finely divided platinum powder and a finely divided rhodium powder in amounts of from 1.0 to 5.0% by weight and not more than 2.0% by weight, respectively, based on the total weight of the sintered product.
Claim 6
Dependent Claim
54 words
An oxygen sensing element according to any one of claim 1 to 4 wherein said sintered product has dispersed therein, in addition to the finely divided platinum group metal powder, a finely divided antisintering material in an amount of from 5 to 70% by weight based on the total weight of the sintered product.
Claim 7
Dependent Claim
20 words
An oxygen sensing element according to claim 5 wherein said antisintering material is identical to that of the solid electrolyte.
Claim 8
Dependent Claim
178 words
An oxygen sensor device for determining the oxygen concentration in an exhaust gas from an automobile internal combustion engine, comprising: (1) an oxygen sensing element which comprises a solid electrolyte member composed of sintered material, and a means for providing a reference oxygen partial pressure, composed of a sintered product of a finely divided metal or metal-metal oxide powder, said means being completely embedded within the solid electrolyte member, said solid electrolyte member having an electrode or electrodes mounted on the external surface thereof, and said sintered product having dispersed therein a finely divided platinum group metal powder in an amount of from 0.5 to 10% by weight, based on the weight of the sintered product; (2) two lead-out wires for transmitting therethrough output signals from the reference oxygen partial pressure-providing means and the electrode or electrodes on the external surface of the solid electrolyte member, respectively, to an electrical measuring circuit, and; (3) a casing for protecting the oxygen sensing element, the casing having a plurality of perforations through which the exhaust gas is allowed to flow.
Claim 9
Dependent Claim
178 words
An oxygen sensor device for determining the oxygen concentration in an exhaust gas from an automobile internal combustion engine, comprising: (1) an oxygen sensing element which comprises a solid electrolyte member composed of sintered material, and a means for providing a reference oxygen partial pressure, composed of a sintered product of a finely divided metal or metal-metal oxide powder, said means being completely embedded within the solid electrolyte member, said solid electrolyte member having an electrode or electrodes mounted on the external surface thereof, and said sintered product having dispersed therein a finely divided platinum group metal powder in an amount of from 0.5 to 10% by weight, based on the weight of the sintered product; (2) two lead-out wires for transmitting therethrough output signals from the reference oxygen partial pressure-providing means and the electrode or electrodes on the external surface of the solid electrolyte member, respectively, to an electrical measuring circuit, and; (3) a casing for protecting the oxygen sensing element, the casing having a plurality of perforations through which the exhaust gas is allowed to flow.
Claim 10
Dependent Claim
41 words
An oxygen sensing element according to claim 5 wherein said antisintering material is at least one material selected from the group consisting of alumina, alumina - magnesia, silica, alumina - silica and a material identical to that of the solid electrolyte.
Claim 11
Dependent Claim
24 words
An oxygen sensing element according to claim 8 wherein said antisintering material is zirconia, zirconia - yttria, zirconia - calcia or Zirconia - magnesia.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |