US3893230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of an exhaust gas sensor for an air-fuel ratio sensing system
Assignee: Ford Motor Co
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Filing: 1973-08-23
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Granted: 1975-07-08
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Expires: 1993-08-23
Abstract
Abstract A titanium dioxide ceramic disc having two spaced electrodes embedded therein is located in the exhaust passage of a reciprocating internal combustion engine. The electrical resistance across the electrodes is proportional to the equilibrium oxygen pressure of the exhaust gases and thus represents the air-fuel ratio of the mixture supplied to the engine.
Inventors
- 👤 Henry L Stadler
- 👤 Tseng-Ying Tien
- 👤 Michael J Esper
- 👤 Donald J Romine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:36
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/622; C04B35/626; C04B35/63; C04B35/632; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1454; F02D41/1455; F02D41/30; F02D9/00; F02D2700/00; F02D2700/09; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02863; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T436/00; Y10T436/21; Y10T436/218
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A PROCESS FOR PREPARING AN EXHAUST GAS SENSING MEMBER COMPRISING THE STEPS OF FORMING A SLURRY OF A MAJOR PORTION OF PARTICLES OF A TRANSITION METAL OXIDE, DRYING THE SLURRY INTO A SHEET, FORMING PLATES FROM THE DRIED SLURRY, SANDWICHING SPACED ELECTRODES BETWEEN A PAIR OF SAID PLATES, AND FIRING THE SANDWICHED PLATES INTO A UNITARY STRUCTURE.
Claim 2
Dependent Claim
57 words
A PROCESS FOR PREPARING AN EXHAUST GAS SENSING MEMBER COMPRISING THE STEPS OF FORMING A SLURRY OF A MAJOR PORTION OF PARTICLES OF A TRANSITION METAL OXIDE, DRYING THE SLURRY INTO A SHEET, FORMING PLATES FROM THE DRIED SLURRY, SANDWICHING SPACED ELECTRODES BETWEEN A PAIR OF SAID PLATES, AND FIRING THE SANDWICHED PLATES INTO A UNITARY STRUCTURE.
Claim 3
Dependent Claim
31 words
The process of claim 1 including the step of sandwiching an electrical heating means between a third plate and one of said pair of plates prior to the step of firing.
Claim 4
Dependent Claim
36 words
The process of claim 1 wherein the slurry is formed of particles of the transition metal oxide capable of being fired to achieve a density of from about 80% of theoretical to about 95% of theoretical.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the slurry is formed of -325 mesh particles of the transition metal oxide.
Claim 6
Dependent Claim
31 words
The process of claim 3 wherein the sandwiched plates are fired at a temperature of from about 2300*F to about 2500*F for a period of time less than about two hours.
Claim 7
Dependent Claim
43 words
The process of claim 1 wherein the step of sandwiching comprises the steps of: placing a pair of plates in confronting relation on opposite sides of a pair of spaced electrodes; and pressing said plates together under a pressure of about 10,000 psi.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |