US4152234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid closed ended tubular oxygen sensor
Assignee: Robert Bosch GmbH
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Filing: 1978-01-11
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Granted: 1979-05-01
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Expires: 1998-01-11
Abstract
Abstract A solid closed ended tubular oxygen sensor element, particularly useful for sensing the oxygen content of exhaust gases from internal combustion engines. The closed end of the tubular element which is adapted to be exposed to the hot exhaust gases is made of zirconium oxide stabilized with yttrium oxide and/or ytterbium dioxide. The remaining main portion of the tubular element is made of zirconium dioxide stabilized with calcium oxide. The invention also provides methods of manufacturing these tubular elements.
Inventors
- 👤 Rudolf Pollner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:27
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A closed ended tubular solid electrolyte oxygen sensor element comprising a generally tubular portion having an integral closed end portion, said generally tubular portion consisting essentially of zirconium dioxide stabilized with calcium oxide, and said end portion consisting essentially of zirconium dioxide stabilized with at least one oxide selected from the group consisting of yttrium oxide and ytterbium oxide.
Claim 2
Dependent Claim
59 words
A closed ended tubular solid electrolyte oxygen sensor element comprising a generally tubular portion having an integral closed end portion, said generally tubular portion consisting essentially of zirconium dioxide stabilized with calcium oxide, and said end portion consisting essentially of zirconium dioxide stabilized with at least one oxide selected from the group consisting of yttrium oxide and ytterbium oxide.
Claim 3
Dependent Claim
14 words
The element of claim 1 wherein said closed end portion is a thin plate.
Claim 4
Dependent Claim
14 words
The element of claim 1 wherein said closed end portion is a rounded portion.
Claim 5
Dependent Claim
61 words
The element of claim 1 wherein said elongated tubular portion consists essentially of zirconium dioxide stabilized with between about 8 and 25 mole percent calcium oxide, and wherein said end portion consists essentially of zirconium dioxide stabilized with between about 4 and 15 mole percent of at least one oxide selected from the group consisting of yttrium oxide and ytterbium oxide.
Claim 6
Dependent Claim
18 words
The element of claim 4 wherein said end portion consists essentially of zirconium dioxide stabilized with yttrium oxide.
Claim 7
Dependent Claim
18 words
The element of claim 4 wherein said end portion consists essentially of zirconium dioxide stabilized with ytterbium oxide.
Claim 8
Dependent Claim
43 words
The element of claim 4 containing between about 10 and 18 mole percent calcium oxide, and wherein said end portion contains between 5 and 8 mole percent of at least one oxide selected from the group consisting of yttrium oxide and ytterbium oxide.
Claim 9
Dependent Claim
18 words
The element of claim 7 wherein said end portion consists essentially of zirconium dioxide stabilized with yttrium oxide.
Claim 10
Dependent Claim
18 words
The element of claim 7 wherein said end portion consists essentially of zirconium dioxide stabilized with ytterbium oxide.
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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |