Patent US2370357A successfully refreshed from Google Patents.
Patent US4976929A successfully refreshed from Google Patents.
US4976929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated catalytic converter
Assignee: BASF Catalysts LLC
•
Filing: 1990-02-20
•
Granted: 1990-12-11
•
Expires: 2010-02-20
Abstract
Abstract There is provided an improved electrically heated accordion folded corrugated thin metal catalytic converter for hydrocarbon or alcohol fueled engine exhaust, particularly internal combustion engine exhaust, having a simplified construction and characterized in that the entire corrugated thin metal monolith, or monoliths, serves as a resistance heater to bring the catalyst up to optimum operating temperature quickly and thereby reduce the escape of pollutants into the atmosphere upon start-up, and which does not depend upon conduction as a mdoe of heat transfer to achieve such temperature.
Inventors
- 👤 Richard C. Cornelison
- 👤 William A. Whittenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:20
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2013; F01N3/2026; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/281; F01N3/2814; F01N2330/00; F01N2330/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
169 words
In a converter for treating an exhaust gas stream to remove one or more pollutants therefrom and comprising in combination a metallic housing having an exhaust gas inlet and a treated exhaust gas outlet, and an accordion folded non-nesting corrugated thin metal foil honeycomb positioned and arranged in juxtaposition with said metallic housing to radially fill said housing, said corrugated thin metal foil honeycomb having on each surface thereof a refractory metal oxide and/or rare earth metal oxide coating optionally including a heavy metal catalyst deposited thereon, the improvement in quick light-off capability comprising (a) insulating means positioned between the metallic housing and the accordion folded non-nesting corrugated thin metal foil honeycomb for insolating the housing electrically, (b) electrical conductors joined to said accordion folded honeycomb to form more than 2 parallel electrical circuits, and (c) a source of electrical potential connected across said electrical conductors, whereby the entire honeycomb of the electrically heated converter may be selectively electrically heated to a temperature of at least 300 degrees F.
Claim 2
Dependent Claim
169 words
In a converter for treating an exhaust gas stream to remove one or more pollutants therefrom and comprising in combination a metallic housing having an exhaust gas inlet and a treated exhaust gas outlet, and an accordion folded non-nesting corrugated thin metal foil honeycomb positioned and arranged in juxtaposition with said metallic housing to radially fill said housing, said corrugated thin metal foil honeycomb having on each surface thereof a refractory metal oxide and/or rare earth metal oxide coating optionally including a heavy metal catalyst deposited thereon, the improvement in quick light-off capability comprising (a) insulating means positioned between the metallic housing and the accordion folded non-nesting corrugated thin metal foil honeycomb for insolating the housing electrically, (b) electrical conductors joined to said accordion folded honeycomb to form more than 2 parallel electrical circuits, and (c) a source of electrical potential connected across said electrical conductors, whereby the entire honeycomb of the electrically heated converter may be selectively electrically heated to a temperature of at least 300 degrees F.
Claim 3
Dependent Claim
19 words
An electrically heated converter in accordance with claim 1 wherein a heavy metal catalyst is present and comprises platinum.
Claim 4
Dependent Claim
19 words
An electrically heated converter in accordance with claim 1 wherein a heavy metal catalyst is present and comprises palladium.
Claim 5
Dependent Claim
19 words
An electrically heated converter in accordance with claim 1 wherein a heavy metal catalyst is present and is palladium.
Claim 6
Dependent Claim
26 words
An electrically heated catalytic converter in accordance with claim 1 wherein a heavy metal catalyst is present and is a mixed catalyst of platinum and rhodium.
Claim 7
Dependent Claim
29 words
An electrically heated catalytic converter in accordance with claim 1 wherein a heavy metal catalyst is present and is a mixed catalyst of platinum and a base metal oxide.
Claim 8
Dependent Claim
20 words
An electrically heated catalytic converter in accordance with claim 1 wherein the thin metal foil is thin stainless steel foil.
Claim 9
Dependent Claim
24 words
An electrically heated catalytic converter in accordance with claim 1 wherein the thin metal foil is thin stainless steel foil coated with aluminum metal.
Claim 10
Dependent Claim
25 words
An electrically heated catalytic converter in accordance with claim 1 wherein the thin metal foil has a thickness of from 0.001 inch to 0.005 inch.
Claim 11
Dependent Claim
18 words
An electrically heated catalytic converter in accordance with claim 1 in which the refractory metal oxide is alumina.
Claim 12
Dependent Claim
18 words
An electrically heated catalytic converter in accordance with claim 1 in which the refractory metal oxide is titania.
Claim 13
Dependent Claim
22 words
An electrically heated catalytic converter in accordance with claim 1 in which the refractory metal oxide is a rare earth metal oxide.
Claim 14
Dependent Claim
30 words
An electrically heated catalytic converter in accordance with claim 1 in which the refractory metal oxide is selected from the group consisting of ceria, lanthia, yttria, and Misch metal oxide.
Claim 15
Dependent Claim
42 words
An electrically heated catalytic converter in accordance with claim 1 wherein the accordion folded corrugated nonnesting thin metal foil honeycomb is composed of a plurality of accordion folded corrugated nonnesting thin metal honeycombs positioned and arranged in parallel between the electrical conductors.
Claim 16
Dependent Claim
36 words
An electrically heated catalytic converter in accordance with claim 1 wherein the electrical potential between any two corrugated laminations in juxtaposition at any point is not in excess of 1.0 volts DC or 0.7 volts AC.
Claim 17
Dependent Claim
36 words
An electrically heated catalytic converter in accordance with claim 1 wherein the entire honeycomb may be selectively heated to a temperature of at least 300 degrees F. in a period of from 2 to 20 seconds.
Claim 18
Dependent Claim
33 words
An electrically heated catalytic converter in accordance with claim 14, wherein said plurality of corrugated thin metal honeycombs are accordion folded along fold lines having a spacing of not more than 1.0 inch.
References Cited (Backward Citations)
US1789812A
Cited
US3768982A
Cited
US3770389A
Cited
DE2333092A1
Cited
DE2359778A1
Cited
US4277442A
Cited
US4205045A
Cited
US4711009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |