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US4469626A
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Composition and method for forming a thick film oxygen sensing element
Assignee: Bendix Corp
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Filing: 1981-05-21
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Granted: 1984-09-04
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Expires: 2001-05-21
Abstract
Abstract A composition for forming a resistive type oxygen sensing element and a method for forming such elements, wherein a mixture of titanium dioxide, glass frit and platinum are used, the titanium dioxide having a particle size within a specific range, and a particular ratio to the other two components of the mixture. The composition is screened over printed platinum leads on a ceramic substrate, with a resistor material also used as a thermistor, and the resistive materials having their own conductive leads in addition to a common lead to the terminals of an oxygen sensor.
Inventors
- 👤 Wayne D. Tuohig
- 👤 Calman S. Sagady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:27
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A composition for forming a resistive oxygen sensitive layer as a conductive pattern on an insulative ceramic substrate to produce a thick film oxygen sensor element comprising: a mixture of rutile titanium dioxide, a fluxing agent and platinum, wherein said titanium dioxide is present in an amount of 28-58 percent by weight of the mixture and has a mean particle size of below 10 micrometers, said fluxing agent is present in an amount of between 2-12 percent by weight of the mixture, and said platinum is present in an amount of between 40-80 percent by weight of the mixture such that upon firing of the composition, a layer of between 10-30 micrometers is formed which comprises a continuous sintered network of titanium oxide particles surrounded by isolated platinum particles.
Claim 2
Dependent Claim
129 words
A composition for forming a resistive oxygen sensitive layer as a conductive pattern on an insulative ceramic substrate to produce a thick film oxygen sensor element comprising: a mixture of rutile titanium dioxide, a fluxing agent and platinum, wherein said titanium dioxide is present in an amount of 28-58 percent by weight of the mixture and has a mean particle size of below 10 micrometers, said fluxing agent is present in an amount of between 2-12 percent by weight of the mixture, and said platinum is present in an amount of between 40-80 percent by weight of the mixture such that upon firing of the composition, a layer of between 10-30 micrometers is formed which comprises a continuous sintered network of titanium oxide particles surrounded by isolated platinum particles.
Claim 3
Dependent Claim
31 words
A composition for forming a resistive oxygen sensitive layer as defined in claim 1 wherein said titanium dioxide is present in an amount of 40 percent by weight of the mixture.
Claim 4
Dependent Claim
48 words
A composition for forming a resistive oxygen sensitive layer as defined in claim 1 wherein said composition is disposed in an organic liquid carrier to enable screening of the composition on a ceramic substrate, said organic liquid carrier being completely vaporizable at a temperature below about 850° C.
Claim 5
Dependent Claim
22 words
A composition for forming a resistive oxygen sensitive layer as defined in claim 4 wherein said organic liquid carrier is alpha terpineol.
References Cited (Backward Citations)
US4000089A
Cited
US4066413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |