US4713166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump cell element for air-fuel ratio sensor
Assignee: Niterra Co Ltd
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Filing: 1986-06-17
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Granted: 1987-12-15
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Expires: 2006-06-17
Abstract
Abstract A pump cell element, for an air-fuel ratio sensor, comprising an oxygen ion conductive zirconia solid electrolyte, a pair of layer electrodes coated on the both surface areas of a measuring portion, and ceramic coating layers each coated on each of said electrodes, at least one of said coating layers disposed on the electrode of a minus side of the pump cell element being provided uniformly and dispersedly with through-pores having a converted diameter of 20-500 μm with an average opening percentage of said through-pores is 5-20%. Blackening at the cathode is effectively eliminated.
Inventors
- 👤 Takao Kojima
- 👤 Hiroyuki Ishiguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:57
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4071
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
87 words
A pump cell element for an air-fuel ratio sensor, the pump cell element comprising: an oxygen ion conductive zirconia solid electrolyte, a pair of layer electrodes coated on the both surface areas of a measuring portion, and ceramic coating layers each coated on each of said electrodes, at least one of said coating layers disposed on the electrode of a minus side of the pump cell element being provided uniformly and dispersedly with through-pores having a converted diameter of at least 20 but less than 500 μm.
Claim 2
Dependent Claim
87 words
A pump cell element for an air-fuel ratio sensor, the pump cell element comprising: an oxygen ion conductive zirconia solid electrolyte, a pair of layer electrodes coated on the both surface areas of a measuring portion, and ceramic coating layers each coated on each of said electrodes, at least one of said coating layers disposed on the electrode of a minus side of the pump cell element being provided uniformly and dispersedly with through-pores having a converted diameter of at least 20 but less than 500 μm.
Claim 3
Dependent Claim
18 words
The pump cell element according to claim 1, wherein said through-pores have an average opening percentage of 5-20%.
Claim 4
Dependent Claim
18 words
The pump cell element according to claim 2, wherein the average opening percentage of said through-pores is 5-15%.
Claim 5
Dependent Claim
19 words
The pump cell element according to claim 1, wherein both of said coating layers are provided with said through-pores.
Claim 6
Dependent Claim
64 words
The pump cell element according to claim 1, wherein said coating layer is applied on at least the entire surface area exposed to exhaust gas in said pump cell element, said coating layer being, except for said through-pores, a dense Al 2 O 3 -base sintered body having pores less than 1 μm to serve as a reinforcing layer of said pump cell element.
Claim 7
Dependent Claim
18 words
The pump cell element according to claim 1, wherein said through-pores have a converted diameter of 80-450 μm.
Claim 8
Dependent Claim
18 words
The pump cell element according to claim 6, wherein said through-pores have a converted diameter of 300-450 μm.
Claim 9
Dependent Claim
18 words
The pump cell element according to claim 1, wherein the average opening percentage of the through-pores is 10-15%.
Claim 10
Dependent Claim
32 words
The pump cell element according to claim 1, wherein said ceramic coating layers are Al 2 O 3 -base ceramics containing at least 60% by weight of Al 2 O 3 .
Claim 11
Dependent Claim
32 words
The pump cell element according to claim 9, wherein said ceramic coating layers are Al 2 O 3 -base ceramics containing at least 90% by weight of Al 2 O 3 .
Claim 12
Dependent Claim
27 words
The pump cell element according to claim 1, wherein said at least one of the ceramic coating layers has a thickness of at least about 100 μm.
Claim 13
Dependent Claim
100 words
A pump cell element for an air-fuel ratio sensor, the pump cell element comprising: an oxygen ion conductive zirconia solid electrolyte, a pair of layer electrodes coated on the surface areas of a measuring portion, and ceramic coating layers each coated on each of said electrodes, at least one of said coating layers disposed on the electrode of a minus side of the pump cell element being provided uniformly and dispersedly with through-pores having a converted diameter of at least 20 but less than 500 μm, said ceramic coating layers having been produced by sintering with the zirconia solid electrolyte.
Claim 14
Dependent Claim
100 words
A pump cell element for an air-fuel ratio sensor, the pump cell element comprising: an oxygen ion conductive zirconia solid electrolyte, a pair of layer electrodes coated on the surface areas of a measuring portion, and ceramic coating layers each coated on each of said electrodes, at least one of said coating layers disposed on the electrode of a minus side of the pump cell element being provided uniformly and dispersedly with through-pores having a converted diameter of at least 20 but less than 500 μm, said ceramic coating layers having been produced by sintering with the zirconia solid electrolyte.
Claim 15
Dependent Claim
22 words
The pump cell element according to claim 12, wherein said through-pores have been formed by masking upon applying said ceramic coating layer.
Claim 16
Dependent Claim
22 words
The pump cell element according to claim 12, wherein said through-pores have been formed by incorporating material to be vanished during sintering.
Claim 17
Dependent Claim
32 words
The pump cell element according to claim 12, wherein said pump cell element further includes at least one reinforcement ceramic coating layer disposed on a supporting leg portion of the solid electrolyte.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |