US4164462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor
Assignee: Hitachi Ltd
•
Filing: 1977-11-28
•
Granted: 1979-08-14
•
Expires: 1997-11-28
Abstract
Abstract A protective layer of zirconia particles having particle sizes of 0.5-5 μM is provided on a surface of an electron-conducting layer of an oxygen sensor at a side of a gas whose oxygen concentration is to be detected to a thickness of 4-100 μM by bonding zirconia particles to one another and the first electron-conducting layer by 10-30% by weight of a high melting point adhesive, such as powders of borosilicate glass, based on total weight of the zirconia particles.
Inventors
- 👤 Norio Ichikawa
- 👤 Kanemasa Sato
- 👤 Sadayasu Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:45
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4077; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9041; H01M4/905; H01M4/9058; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
An oxygen sensor, which comprises a zirconia layer for transmitting oxygen ions therethrough, provided to separate a gas whose oxygen concentration is to be detected from a reference gas; a first electron-conducting layer having a catalytic action, provided on a surface of the zirconia layer on the side of the gas whose oxygen concentration is to be detected; a second electron-conducting layer for ionizing oxygen molecules in the reference gas and taking the oxygen ions into the zirconia layer, provided on a surface of the zirconia layer on the side of the reference gas; and a protective layer of zirconia particles provided on the outer surface of the first electron-conducting layer, said zirconia particles being bonded to one another and to the first electron-conducting layer by a high melting point adhesive comprising a powder of borosilicate glass, water glass having a melting point of 900° C. or higher, a phosphate, or cement, whereby an electrical signal is generated between the first and the second electron-conducting layers in accordance with the difference in oxygen concentrations between the gas whose oxygen concentration is to be detected and the reference gas.
Claim 2
Dependent Claim
188 words
An oxygen sensor, which comprises a zirconia layer for transmitting oxygen ions therethrough, provided to separate a gas whose oxygen concentration is to be detected from a reference gas; a first electron-conducting layer having a catalytic action, provided on a surface of the zirconia layer on the side of the gas whose oxygen concentration is to be detected; a second electron-conducting layer for ionizing oxygen molecules in the reference gas and taking the oxygen ions into the zirconia layer, provided on a surface of the zirconia layer on the side of the reference gas; and a protective layer of zirconia particles provided on the outer surface of the first electron-conducting layer, said zirconia particles being bonded to one another and to the first electron-conducting layer by a high melting point adhesive comprising a powder of borosilicate glass, water glass having a melting point of 900° C. or higher, a phosphate, or cement, whereby an electrical signal is generated between the first and the second electron-conducting layers in accordance with the difference in oxygen concentrations between the gas whose oxygen concentration is to be detected and the reference gas.
Claim 3
Dependent Claim
21 words
An oxygen sensor according to claim 1, wherein particle sizes of the zirconia particles for the protective layer are 0.5-5 μM.
Claim 4
Dependent Claim
16 words
An oxygen sensor according to claim 1, wherein thickness of the protective layer is 4-100 μM.
Claim 5
Dependent Claim
31 words
An oxygen sensor according to claim 1, wherein 10-30% by weight of the high melting point adhesive, based on total weight of the zirconia particle is used for the protective layer.
Claim 6
Dependent Claim
211 words
An oxygen sensor, which comprises a zirconia layer for transmitting oxygen ions therethrough, provided to separate a gas whose oxygen concentration is to be detected from a reference gas; a first electron-conducting layer having a catalytic action, provided on a surface of the zirconia layer on the side of the gas whose oxygen concentration is to be detected; a second electron-conducting layer for ionizing oxygen molecules in the reference gas and taking the oxygen ions into the zirconia layer, provided on a surface of the zirconia layer on the side of the reference gas; and a protective layer of zirconia particles having particle sizes of 0.5-5 μM to a thickness of 4-100 μM provided on the outer surface of the first electron-conducting layer, said zirconia particles being bonded to one another and to the first electron-conducting layer by 10-30% by weight of a high melting point adhesive, based on total weight of the zirconia particles, comprising a powder of borosilicate glass, water glass having a melting point of 900° C. or higher, a phosphate, or cement, whereby an electrical signal is generated between the first and second electron-conducting layers in accordance with a difference in oxygen concentration between the gas whose oxygen concentration is to be detected, and the reference gas.
Claim 7
Dependent Claim
211 words
An oxygen sensor, which comprises a zirconia layer for transmitting oxygen ions therethrough, provided to separate a gas whose oxygen concentration is to be detected from a reference gas; a first electron-conducting layer having a catalytic action, provided on a surface of the zirconia layer on the side of the gas whose oxygen concentration is to be detected; a second electron-conducting layer for ionizing oxygen molecules in the reference gas and taking the oxygen ions into the zirconia layer, provided on a surface of the zirconia layer on the side of the reference gas; and a protective layer of zirconia particles having particle sizes of 0.5-5 μM to a thickness of 4-100 μM provided on the outer surface of the first electron-conducting layer, said zirconia particles being bonded to one another and to the first electron-conducting layer by 10-30% by weight of a high melting point adhesive, based on total weight of the zirconia particles, comprising a powder of borosilicate glass, water glass having a melting point of 900° C. or higher, a phosphate, or cement, whereby an electrical signal is generated between the first and second electron-conducting layers in accordance with a difference in oxygen concentration between the gas whose oxygen concentration is to be detected, and the reference gas.
References Cited (Backward Citations)
GB1201806A
Cited
US3978006A
Cited
US4021326A
Cited
US3843400A
Cited
JPS4963991A
Cited
US4080276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |