US4597850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor
Assignee: Hitachi Ltd
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Filing: 1985-04-02
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Granted: 1986-07-01
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Expires: 2005-04-02
Abstract
Abstract An oxygen sensor for monitoring the oxygen concentration in exhaust gases of an engine of a motor vehicle including a sensor element supported by a base in a position remote from the flow of exhaust gases to be tested whereby solid particles in the exhaust gases are prevented from being deposited on the sensor element and the sensor element is imprevious to influences exerted by the temperature and flow velocity of the flow of exhaust gases. The oxygen sensor is capable of stably monitoring the oxygen concentration in exhaust gases of an engine of a motor vehicle with a high degree of performance over a prolonged period of time.
Inventors
- 👤 Toru Takahasi
- 👤 Sadayasu Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:06
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4077
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
An oxygen sensor of a double cylinder type, comprising: a sensor element; an inner cylindrical member formed with gas ports, said inner cylindrical member housing said sensor element and being closed at a bottom end thereof; an outer cylindrical member enclosing said inner cylindrical member, said outer cylindrical member being closed at a bottom end thereof; wherein said gas ports are formed at a peripheral wall of said inner cylindrical member in positions in which they are not in face-to-face relation to the sensor element; and wherein gas ports are formed at a peripheral wall of said outer cylindrical member in positions in which they are not in face-to-face relation to the gas ports formed at the peripheral wall of the inner cylindrical member.
Claim 2
Dependent Claim
124 words
An oxygen sensor of a double cylinder type, comprising: a sensor element; an inner cylindrical member formed with gas ports, said inner cylindrical member housing said sensor element and being closed at a bottom end thereof; an outer cylindrical member enclosing said inner cylindrical member, said outer cylindrical member being closed at a bottom end thereof; wherein said gas ports are formed at a peripheral wall of said inner cylindrical member in positions in which they are not in face-to-face relation to the sensor element; and wherein gas ports are formed at a peripheral wall of said outer cylindrical member in positions in which they are not in face-to-face relation to the gas ports formed at the peripheral wall of the inner cylindrical member.
Claim 3
Dependent Claim
29 words
An oxygen sensor as claimed in claim 1, wherein said gas ports formed at the peripheral wall of the outer cylindrical member are in the form of louvered slots.
Claim 4
Dependent Claim
21 words
An oxygen sensor as claimed in claim 4, wherein said outer cylindrical member is formed with gas ports at its bottom.
Claim 5
Dependent Claim
26 words
An oxygen sensor as claimed in claim 1, wherein said outer cylindrical member is closed at its bottom by a bottom wall formed with gas ports.
Claim 6
Dependent Claim
93 words
An oxygen sensor of a double cylinder type, comprising: a sensor element; an inner cylindrical member formed with gas ports, said inner cylindrical member housing said sensor element; and an outer cylindrical member enclosing said inner cylindrical memeber; wherein at least said inner cylindrical member is closed at its bottom and said gas ports are formed at a peripheral wall of said inner cylindrical member in positions in which they are not in face-to-face relation to said sensor element; and wherein said inner cylindrical member is formed with gas ports at its bottom.
Claim 7
Dependent Claim
93 words
An oxygen sensor of a double cylinder type, comprising: a sensor element; an inner cylindrical member formed with gas ports, said inner cylindrical member housing said sensor element; and an outer cylindrical member enclosing said inner cylindrical memeber; wherein at least said inner cylindrical member is closed at its bottom and said gas ports are formed at a peripheral wall of said inner cylindrical member in positions in which they are not in face-to-face relation to said sensor element; and wherein said inner cylindrical member is formed with gas ports at its bottom.
Claim 8
Dependent Claim
61 words
An oxygen sensor as claimed in claim 5, wherein an open end portion of said inner cylindrical member is outwardly spread to provide an outwardly spread open end portion whereby the inner cylindrical member is maintained at the outwardly spread open end portion in contact with an inner surface of the peripheral wall of the outer cylindrical member and supported thereby.
Claim 9
Dependent Claim
30 words
An oxygen sensor as claimed in claim 5, wherein said inner cylindrical member is firmly secured at its bottom to the bottom of said outer cylindrical member and supported thereby.
Claim 10
Dependent Claim
32 words
An oxygen sensor as claimed in claim 5, wherein the gas ports formed at said inner cylindrical member are located at said outwardly spread open end portion of the inner cylindrical member.
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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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |