Patent US5707148A successfully refreshed from Google Patents.
US5707148A
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Catalytic calorimetric gas sensor
Assignee: SAMUEL V ALBIMINO
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Filing: 1994-09-23
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Granted: 1998-01-13
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Expires: 2014-09-23
Abstract
Abstract Disclosed is a method to make and an apparatus for monitoring the exhaust gas conversion efficiency of a catalytic converter. The catalytic calorimetric sensor disclosed includes a sol-gel processed washcoat and sol-processed catalytically active metal particles. Sol-gel processing creates a washcoat with high surface area and controlled porosity which increases the sensitivity, durability, and reproducibility of the resultant sensor.
Inventors
- 👤 Jacobus Hendrik Visser
- 👤 Chaitanya Kumar Narula
- 👤 Margherita Zanini-Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16; C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; G01N25/00; G01N25/20; G01N25/22; G01N25/28; G01N25/30; C04B2111/00; C04B2111/00474; C04B2111/0081
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
A catalytic calorimetric sensor, comprising: a substrate; a temperature measuring layer disposed on said substrate; and a sol-gel processed catalytic layer disposed on said temperature measuring layer to provide a thin catalytic layer having increased sensitivity.
Claim 2
Dependent Claim
36 words
A catalytic calorimetric sensor, comprising: a substrate; a temperature measuring layer disposed on said substrate; and a sol-gel processed catalytic layer disposed on said temperature measuring layer to provide a thin catalytic layer having increased sensitivity.
Claim 3
Dependent Claim
30 words
The sensor of claim 1, wherein said substrate comprises a low thermal conductivity material selected from the group consisting of aluminum oxide, silicon oxide, silicon nitride, polysilicon and combinations thereof.
Claim 4
Dependent Claim
11 words
The sensor of claim 1, wherein said substrate is silicon micromachined.
Claim 5
Dependent Claim
19 words
The sensor of claim 1, wherein said substrate has a thickness in the range of 500 to 1000 nm.
Claim 6
Dependent Claim
40 words
The sensor of claim 1, wherein said temperature measuring layer comprises a temperature measuring device selected from the group consisting of a thermocouple, a temperature dependent metal resistor, a temperature dependent semiconductor resistor, a p-n junction semiconductor and a thermopile.
Claim 7
Dependent Claim
47 words
The sensor of claim 1, wherein said sol-gel processed catalytic layer comprises: a sol-gel processed washcoat, wherein said washcoat is selected from the group consisting of alumina, silica and mixtures thereof; and a plurality of sol-gel processed catalytically active metal particles deposited on said sol-gel processed washcoat.
Claim 8
Dependent Claim
31 words
The sensor of claim 6, wherein said catalytically active metal particles are noble metals selected from the group consisting of platinum, palladium, silver, gold, ruthenium, rhodium, osmium, iridium, and mixtures thereof.
Claim 9
Dependent Claim
45 words
The sensor of claim 1, wherein said sol-gel processed catalytic layer comprises: a sol-gel processed washcoat, wherein said washcoat is selected from the group consisting of alumina, silica and mixtures thereof; and a plurality of catalytically active metal particles deposited on said sol-gel processed washcoat.
Claim 10
Dependent Claim
31 words
The sensor of claim 8, wherein said catalytically active metal particles are noble metals selected from the group consisting of platinum, palladium, silver, gold, ruthenium, rhodium, osmium, iridium, and mixtures thereof.
Claim 11
Dependent Claim
48 words
The sensor of claim 1, wherein said sol-gel processed catalytic layer comprises: a sol-gel processed washcoat; and a plurality of catalytically active metal particles deposited on said sol-gel processed washcoat such that the catalytic calorimetric gas sensor has an increased number of active sites and an enhanced sensitivity.
Claim 12
Dependent Claim
14 words
The sensor of claim 10 wherein said catalytically active metal particles are sol-gel processed.
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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) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |