US5144249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor
Assignee: NGK Insulators Ltd
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Filing: 1991-03-13
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Granted: 1992-09-01
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Expires: 2011-03-13
Abstract
Abstract An oxygen sensor has an oxygen sensor element in the form of an elongated plate having an oxygen detection section at the end of said oxygen sensor element. The oxygen detection section generates electromotive force between electrodes according to oxygen concentration or varies electrical resistance. Chamfering is applied to ridges formed parallel to the lengthwise direction of the oxygen sensor element which is exposed to gas to be measured. According to this sensor, cracks do not occur. Therefore, oxygen concentration detecting function is not damaged even when the oxygen sensor element is thermally stressed.
Inventors
- 👤 Akiyoshi Kurishita
- 👤 Masanori Katsu
- 👤 Masami Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:27
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4071
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
An oxygen sensor comprising an oxygen sensor element in the form of an elongated plate having an oxygen detection section having defined edges at the end of said oxygen sensor element, said oxygen detection section generating electromotive force between electrodes according to oxygen concentration or varying electrical resistance, said oxygen detection section generating electromotive force comprising a measuring electrode formed on one surface of a solid electrolytic body, a porous protective layer, and a reference electrode formed on the other surface of the solid electrolytic body, chamfering being applied to edges formed parallel to the lengthwise direction of said oxygen sensor element which is exposed to gas to be measured.
Claim 2
Dependent Claim
110 words
An oxygen sensor comprising an oxygen sensor element in the form of an elongated plate having an oxygen detection section having defined edges at the end of said oxygen sensor element, said oxygen detection section generating electromotive force between electrodes according to oxygen concentration or varying electrical resistance, said oxygen detection section generating electromotive force comprising a measuring electrode formed on one surface of a solid electrolytic body, a porous protective layer, and a reference electrode formed on the other surface of the solid electrolytic body, chamfering being applied to edges formed parallel to the lengthwise direction of said oxygen sensor element which is exposed to gas to be measured.
Claim 3
Dependent Claim
22 words
An oxygen sensor according to claim 1, wherein chamfering is applied to both the porous protective layer and the solid electrolytic body.
Claim 4
Dependent Claim
15 words
An oxygen sensor according to claim 1, wherein the edges are chamfered in a taper-shape.
Claim 5
Dependent Claim
14 words
An oxygen sensor according to claim 1, wherein the edges are chamfered in R-shape.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |