Patent US4007435A successfully refreshed from Google Patents.
US4007435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensor device and method of manufacturing same
Assignee: Individual
•
Filing: 1974-04-25
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Granted: 1977-02-08
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Expires: 1994-04-25
Abstract
Abstract An oxygen sensing device particularly suited as a sensor for the exhaust gases of internal combustion engines, the sensing device comprising an electrically insulative ceramic element having bonded on the surface thereof a layer of an oxygen sensing metal oxide, preferably titania, and a pair of electrical leads for the oxygen sensing metal oxide, the device also having a layer of electrical resistance heating material adjacent to the layer of oxygen sensing metal oxide but separated therefrom by a layer of the electrically insulative ceramic, a pair of electrical leads for the electrical resistance heating material, and a layer of ceramic covering the layer of electrical resistance heating material.
Inventors
- 👤 Tseng-Ying Tien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
135 words
An oxygen sensing device particularly suited as a sensor for the exhaust gases of an internal combustion engine, said sensing device comprising an electrically insulative ceramic element having bonded on a surface thereof a layer of an oxygen sensing metal oxide, electrical leads for the oxygen sensing metal oxide, a thin layer of electrical resistance heating material adjacent the layer of oxygen sensing metal oxide but separated from said layer of oxygen sensing metal oxide by a layer of the electrical insulative ceramic, electrical leads for the electrical resistance heating material, and a layer of ceramic covering the layer of electrical resistance material, said device also including a layer of thermistor material bonded to a surface of said ceramic element adjacent said layer of oxygen sensing metal oxide and electrical leads for said thermistor material.
Claim 2
Dependent Claim
135 words
An oxygen sensing device particularly suited as a sensor for the exhaust gases of an internal combustion engine, said sensing device comprising an electrically insulative ceramic element having bonded on a surface thereof a layer of an oxygen sensing metal oxide, electrical leads for the oxygen sensing metal oxide, a thin layer of electrical resistance heating material adjacent the layer of oxygen sensing metal oxide but separated from said layer of oxygen sensing metal oxide by a layer of the electrical insulative ceramic, electrical leads for the electrical resistance heating material, and a layer of ceramic covering the layer of electrical resistance material, said device also including a layer of thermistor material bonded to a surface of said ceramic element adjacent said layer of oxygen sensing metal oxide and electrical leads for said thermistor material.
Claim 3
Dependent Claim
23 words
An oxygen sensing device as set forth in claim 1 wherein said electrically insulative ceramic element is in the form of a plate.
Claim 4
Dependent Claim
21 words
An oxygen sensing device as set forth in claim 2 wherein said layer of ceramic is monolithic with said ceramic element.
Claim 5
Dependent Claim
25 words
An oxygen sensing device as set forth in claim 3 wherein said ceramic element has a thickness less than that of said layer of ceramic.
Claim 6
Dependent Claim
35 words
An oxygen sensing device as set forth in claim 4 wherein the thickness of said element is less than about 1/16 inch, the thickness of said layer of ceramic is greater than about 1/16 inch.
Claim 7
Dependent Claim
47 words
An oxygen sensing device as set forth in claim 5 wherein said layer of oxygen sensing metal oxide is titanium oxide, has a thickness not greater than about 1/16 inch and a density of from about 80% to 90% of the theoretical highest density for titanium oxide.
Claim 8
Dependent Claim
31 words
An oxygen sensing device as set forth in claim 6 wherein said device also includes a temperature sensing element to measure the temperature of the layer of oxygen sensing metal oxide.
Claim 9
Dependent Claim
21 words
An oxygen sensing device as set forth in claim 7 wherein said temperature sensing element is a layer of thermistor material.
Claim 10
Dependent Claim
23 words
An oxygen sensing device as set forth in claim 8 wherein said ceramic element and said layer of ceramic are aluminum oxide ceramic.
Claim 11
Dependent Claim
30 words
An oxygen sensing device as set forth in claim 1 wherein said layer of oxygen sensing metal oxide is titanium oxide and wherein said ceramic element is aluminum oxide ceramic.
Claim 12
Dependent Claim
21 words
An oxygen sensing device as set forth in claim 1 wherein said layer of ceramic is monolithic with said ceramic element.
Claim 13
Dependent Claim
31 words
An oxygen sensing device as set forth in claim 1 wherein said device also includes a temperature sensing element to measure the temperature of said layer of oxygen sensing metal oxide.
Claim 14
Dependent Claim
55 words
An oxygen sensing device as set forth in claim 1 wherein said ceramic element is in the form of an elongated plate, said layers of oxygen sensing metal oxide and electrical resistance heating material being adjacent one end of said elongated plate and the electrical leads extending toward the other end of said elongated plate.
Claim 15
Dependent Claim
21 words
An oxygen sensing device as set forth in claim 13 wherein said layer of ceramic is monolithic with said ceramic element.
Claim 16
Dependent Claim
27 words
An oxygen sensing device as set forth in claim 13 wherein said other end of said elongated plate is mounted in a body of electrically insulative material.
Claim 17
Dependent Claim
33 words
An oxygen sensing device as set forth in claim 15 wherein said body of electrically insulative material is secured within a metal tube, said metal tube having means thereon for mounting said device.
Claim 18
Dependent Claim
45 words
An oxygen sensing device as set forth in claim 13 wherein said device also includes a layer of thermistor material bonded to said ceramic element adjacent said layer of oxygen sensing metal oxide for measuring the temperature of said layer of oxygen sensing metal oxide.
Claim 19
Dependent Claim
40 words
An oxygen sensing device as set forth in claim 13 wherein each of said pair of leads for said layer of oxygen sensing metal oxide comprises a thin elongated layer of metal bonded to the surface of said ceramic element.
Claim 20
Dependent Claim
87 words
An oxygen sensing device as set forth in claim 1 wherein said ceramic element is in the form of a plate, wherein said layer of ceramic is also in the form of a plate, said second mentioned plate being bonded to said first mentioned plate, and wherein said layer of electrical resistance heating material is bonded to said second mentioned plate, each of the electrical leads for said layer of electrical resistance heating material comprising a thin elongated layer of metal bonded to said second mentioned plate.
Claim 21
Dependent Claim
23 words
An oxygen sensing device as set forth in claim 19 wherein said plates are bonded together so as to form a monolithic structure.
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |