US4929581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic diesel soot filter
Assignee: Dornier System GmbH
•
Filing: 1988-05-16
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Granted: 1990-05-29
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Expires: 2008-05-16
Abstract
Abstract Subject of the invention is a diesel-soot filter with catalytically-active coating for reducing the ignition temperature of the diesel-soot deposited on a filter, the active substance of the coating being a metal-doped zeolite.
Inventors
- 👤 Juergen Steinwandel
- 👤 Juergen Haas
- 👤 Carsten Plog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J; B01J37/00; B01J37/02; B01J37/024; B01J37/0246; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/033; F01N3/035; B01J29/00; B01J29/04; B01J29/06; B01J29/061; B01J29/18; B01J29/20; B01J29/22; F01N2330/00; F01N2330/06; F01N2510/00; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
Catalytically active coating of filter material for Dieselsoot filter characterized in that the coating is comprised of a zeolite having a pore diameter from 0.55 to 1.3 namometers, the zeolite being doped with a metal of the platinum group.
Claim 2
Dependent Claim
39 words
Catalytically active coating of filter material for Dieselsoot filter characterized in that the coating is comprised of a zeolite having a pore diameter from 0.55 to 1.3 namometers, the zeolite being doped with a metal of the platinum group.
Claim 3
Dependent Claim
19 words
Catalytically-active coating in accordance with claim 1 characterized in that the coating is a zeolite of the mordenite group.
Claim 4
Dependent Claim
14 words
Catalytically-active coating in accordance with claim 1 characterized in that the metal is platinum.
Claim 5
Dependent Claim
35 words
Catalytically-active coating in accordance with claim 1 characterized in that the zeolite includes, in additon, a metal of the groups 1B, 2B, 5B 6B or 7B of the period system, or of a combination thereof.
Claim 6
Dependent Claim
23 words
Catalytically-active coating in accordance with claim 4 characterized in that the metal is nickel, copper, manganese, vanadium, or silver, or a combination thereof.
Claim 7
Dependent Claim
13 words
Catalytically-active coating in accordance with claim 4 characterized in that metal is nickel.
Claim 8
Dependent Claim
25 words
Catalytically-active coating in accordance with claim 5 characterized in that the atomic ratio of platinum to nickel in the zeolite is between 1:20 and 20:1.
Claim 9
Dependent Claim
24 words
Catalytic dieselsoot filter characterized in that the catalytically-active coating in accordance with claim 1 is deposited as a structural strengthener of a filter element.
Claim 10
Dependent Claim
37 words
Catalytic filter in accordance with claim 8 characterized in that the filter element is a packing of minerals of metal wool of ceramic foam of a monolithic honeycomb structure or a monolithic honeycomb structure with alternating-closed channels.
Claim 11
Dependent Claim
25 words
Catalytic filter in accordance with claim 8 characterized in that prior to applying a catalytically-active mass a coating of an inert ceramic material is provided.
Claim 12
Dependent Claim
34 words
Catalytic filter in accordance with claim 8 characterized in that the catalytically active coating is simultaneously added on with an inert oxide material of aluminium, titanium, zirconium, or silicon or of a combination thereof.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |