Patent US4249156A successfully refreshed from Google Patents.
US4249156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uncompensated low temperature stoichiometric air/fuel ratio exhaust gas sensor
Assignee: Motors Liquidation Co
•
Filing: 1979-03-09
•
Granted: 1981-02-03
•
Expires: 1999-03-09
Abstract
Abstract A titanium oxide resistive-type exhaust gas oxygen sensor having a unique microstructure of interlocked highly irregular, flake-like particles forming a highly durable porous body preferably having a surface area greater than about 3 square meters per gram. A method for producing such particles and forming them into such a high surface area body is also described.
Inventors
- 👤 Adolph L. Micheli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/622; C04B35/624
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
In a resistive-type exhaust gas oxygen sensor exhibiting a significant change in electrical resistance of titanium oxide in response to deviation in exhaust gas content from stoichiometry, the improvement comprising an interlocked, highly irregular flake-like microstructure in the titanium dioxide having a surface area greater than about 3 square meters per gram for enhancing equilibration and more significant electrical resistance change at lower temperatures.
Claim 2
Dependent Claim
64 words
In a resistive-type exhaust gas oxygen sensor exhibiting a significant change in electrical resistance of titanium oxide in response to deviation in exhaust gas content from stoichiometry, the improvement comprising an interlocked, highly irregular flake-like microstructure in the titanium dioxide having a surface area greater than about 3 square meters per gram for enhancing equilibration and more significant electrical resistance change at lower temperatures.
Claim 3
Dependent Claim
98 words
In a resistive-type exhaust gas oxygen sensor exhibiting a significant change in electrical resistance of sintered titanium oxide particles as a function of departures in exhaust gas content from stoichiometry, the improvement wherein said particles are generally platelet in character, have a maximum dimension of the order of about 100 angstroms and have a highly irregular periphery that enhances particle interlock, and said particles are interlocked in said body to form a durable highly porous microstructure having a sufficiently large surface area to permit a more significant resistance change to occur at exhaust gas temperatures below 300° C.
Claim 4
Dependent Claim
98 words
In a resistive-type exhaust gas oxygen sensor exhibiting a significant change in electrical resistance of sintered titanium oxide particles as a function of departures in exhaust gas content from stoichiometry, the improvement wherein said particles are generally platelet in character, have a maximum dimension of the order of about 100 angstroms and have a highly irregular periphery that enhances particle interlock, and said particles are interlocked in said body to form a durable highly porous microstructure having a sufficiently large surface area to permit a more significant resistance change to occur at exhaust gas temperatures below 300° C.
References Cited (Backward Citations)
US3479257A
Cited
US3558280A
Cited
US3886785A
Cited
US3893230A
Cited
US4007435A
Cited
US3932246A
Cited
US4151503A
Cited
US4138881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |