US4895707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soot burn-off filter for diesel engines
Assignee: Daimler Benz AG
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Filing: 1989-02-16
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Granted: 1990-01-23
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Expires: 2009-02-16
Abstract
Abstract Meander-shaped exhaust gas ducts pass through a soot burn-off filter made of porous ceramic filter material. Catalytically coated blind ducts branch from each of the outer bends to receive and combust solid combustion residues from the exhaust gases. The residual gases produced in the blind ducts by the oxidation of the combustion residues pass through the filter material into adjacent discharge ducts and are transported from there to the outside of the filter. In this way the exhaust gas ducts remain largely free of solid combustion residues, display no clogging phenomena and therefore keep the exhaust gas backpressure low. This improves the starting behavior of an engine, achieves more favorable warm-up behavior and has a positive influence upon the response behavior of an exhaust gas turbocharger.
Inventors
- 👤 Michael Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:38
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/033; F01N3/035; F01N3/022; F01N3/0222; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N2250/00; F01N2250/02; F01N2330/00; F01N2330/06; F01N2510/00; F01N2510/06; F01N2510/065; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
74 words
A soot burn-off filter for diesel engines, comprising a porous ceramic filter material with exhaust gas ducts which pass through the latter in meander shape from an inflow side connected to the engine to an outflow side; the exhaust gas ducts opening into branching blind ducts at outer bends of their meander shapes; and adjacent discharge ducts in said porous ceramic filter material open towards the outflow side and associated with said blind ducts.
Claim 2
Dependent Claim
74 words
A soot burn-off filter for diesel engines, comprising a porous ceramic filter material with exhaust gas ducts which pass through the latter in meander shape from an inflow side connected to the engine to an outflow side; the exhaust gas ducts opening into branching blind ducts at outer bends of their meander shapes; and adjacent discharge ducts in said porous ceramic filter material open towards the outflow side and associated with said blind ducts.
Claim 3
Dependent Claim
17 words
A soot burn-off filter according to claim 1, wherein the blind ducts extend towards the outflow side.
Claim 4
Dependent Claim
18 words
A soot burn-off filter according to claim 1, wherein the discharge ducts extend parallel to the blind ducts.
Claim 5
Dependent Claim
18 words
A soot burn-off filter according to claim 1, wherein the blind ducts are provided with a catalytic coating.
Claim 6
Dependent Claim
18 words
A soot burn-off filter according to claim 2, wherein the blind ducts are provided with a catalytic coating.
Claim 7
Dependent Claim
22 words
A soot burn-off filter according to claim 1, wherein the filter consists of individual filter elements which are arranged superposed in layers.
Claim 8
Dependent Claim
22 words
A soot burn-off filter according to claim 2, wherein the filter consists of individual filter elements which are arranged superposed in layers.
Claim 9
Dependent Claim
22 words
A soot burn-off filter according to claim 3, wherein the filter consists of individual filter elements which are arranged superposed in layers.
Claim 10
Dependent Claim
22 words
A soot burn-off filter according to claim 4, wherein the filter consists of individual filter elements which are arranged superposed in layers.
Claim 11
Dependent Claim
22 words
A soot burn-off filter according to claim 5, wherein the filter consists of individual filter elements which are arranged superposed in layers.
Claim 12
Dependent Claim
20 words
A soot burn-off filter according to claim 6, wherein the filter elements are separated from each other by cover plates.
Claim 13
Dependent Claim
20 words
A soot burn-off filter according to claim 7, wherein the filter elements are separated from each other by cover plates.
Claim 14
Dependent Claim
20 words
A soot burn-off filter according to claim 8, wherein the filter elements are separated from each other by cover plates.
Claim 15
Dependent Claim
20 words
A soot burn-off filter according to claim 9, wherein the filter elements are separated from each other by cover plates.
Claim 16
Dependent Claim
20 words
A soot burn-off filter according to claim 10, wherein the filter elements are separated from each other by cover plates.
Claim 17
Dependent Claim
20 words
A soot burn-off filter according to claim 6, wherein the filter elements and their cover plates are connected by sintering.
Claim 18
Dependent Claim
20 words
A soot burn-off filter according to claim 7, wherein the filter elements and their cover plates are connected by sintering.
Claim 19
Dependent Claim
20 words
A soot burn-off filter according to claim 8, wherein the filter elements and their cover plates are connected by sintering.
Claim 20
Dependent Claim
20 words
A soot burn-off filter according to claim 9, wherein the filter elements and their cover plates are connected by sintering.
Claim 21
Dependent Claim
20 words
A soot burn-off filter according to claim 10, wherein the filter elements and their cover plates are connected by sintering.
References Cited (Backward Citations)
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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) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |