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US4477417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for reducing the ignition temperature of diesel soot
Assignee: DMC2 Degussa Metals Catalysts Cerdec AG
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Filing: 1983-10-14
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Granted: 1984-10-16
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Expires: 2003-10-14
Abstract
Abstract A process and catalyst is disclosed for the reduction of the ignition temperature of diesel soot filtered out of the exhaust fumes of diesel engines by passing the exhaust stream through a filter element. The filter element is a temperature resistant inert support onto which is deposited a catalytically effective amount of silver vanadate or a mixture of the temperature resistant carrier material and a catalytically effective amount of silver vanadate.
Inventors
- 👤 Rainer Domesle
- 👤 Herbert Volker
- 👤 Edgar Koberstein
- 👤 Hans-Dieter Pletka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:25
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/682; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/033; F01N3/035; B01J35/00; B01J35/50; B01J35/56; B01J35/57; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A process for the reduction of the ignition temperature of diesel soot filtered out of the exhaust of diesel engines comprising passing the exhaust stream through a filter element, the filter element being a temperature-resistant inert support onto which is deposited a catalytically effective amount of silver vanadate or a mixture of a temperature resistant carrier material and a catalytically effective amount of silver vanadate.
Claim 2
Dependent Claim
65 words
A process for the reduction of the ignition temperature of diesel soot filtered out of the exhaust of diesel engines comprising passing the exhaust stream through a filter element, the filter element being a temperature-resistant inert support onto which is deposited a catalytically effective amount of silver vanadate or a mixture of a temperature resistant carrier material and a catalytically effective amount of silver vanadate.
Claim 3
Dependent Claim
27 words
The process as set forth in claim 1, wherein a temperature-resistant metal- or mineral wool packing or a steel screen filter element employed as support is used.
Claim 4
Dependent Claim
55 words
The process as set forth in claim 1, wherein as a support there is used a monolithic honeycomb ceramic body with a plurality of parallel flow passages whose openings in opposite faces are provided with sealing material, so that in each case a flow passage open on one face is closed on the opposite face.
Claim 5
Dependent Claim
35 words
The process as set forth in claim 1, wherein a catalytically active filter element is used which is arranged in the flow area of a housing provided with inlet and outlet passages for the exhaust.
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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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |