Patent US4971769A successfully refreshed from Google Patents.
US4971769A
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US
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Filter device for use in heating or incineration plants
Assignee: Schwaebische Huettenwerke Automotive GmbH
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Filing: 1989-08-18
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Granted: 1990-11-20
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Expires: 2009-08-18
Abstract
Abstract A device for use in heating or incineration plants for use as a waste gas filter to eliminate and/or convert harmful elements in the waste gas is disclosed. The device of the subject invention can eliminate soot and soot-like products, or it can serve as a heat exchanger or as a mixing component for a furnace. The device of the subject invention comprises a sintered body made of one or more compression molded highly heat resistant sintered parts. The sintered body manifests high porosity and/or a multitude of intake and outlet channels.
Inventors
- 👤 Hans A. Haerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:37
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2072; B01D39/2075; B01D46/00; B01D46/10; B01D46/12; B22; B22F; B22F7/00; B22F7/002; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0222; F01N2330/00; F01N2330/14; F01N2370/00; F01N2370/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
142 words
A gas filter, suitable for removing soot and harmful elements from a combustion exhaust gas stream in heating and incineration plants, which comprises a plurality of identically sized and shaped gas-permeable, highly porous, compression molded and sintered catalytic metal plates, each plate having a front face and a back face; each front face containing a plurality of channels positioned between channel-separating walls; each channel having an open end and a closed end provided by a closing cross strut; with adjacent plates of said plurality being positioned with front faces against back faces and with adjacent plates being rotated 180° with respect to each other to provide a head-to-toe arrangement of adjacent plates for providing pluralities of inlet channels alternating with pluralities of parallel outlet channels within said gas filter; and with said plates being sintered together to form a monolithic filter body.
Claim 2
Dependent Claim
142 words
A gas filter, suitable for removing soot and harmful elements from a combustion exhaust gas stream in heating and incineration plants, which comprises a plurality of identically sized and shaped gas-permeable, highly porous, compression molded and sintered catalytic metal plates, each plate having a front face and a back face; each front face containing a plurality of channels positioned between channel-separating walls; each channel having an open end and a closed end provided by a closing cross strut; with adjacent plates of said plurality being positioned with front faces against back faces and with adjacent plates being rotated 180° with respect to each other to provide a head-to-toe arrangement of adjacent plates for providing pluralities of inlet channels alternating with pluralities of parallel outlet channels within said gas filter; and with said plates being sintered together to form a monolithic filter body.
Claim 3
Dependent Claim
20 words
A gas filter according to claim 1 further including a gas-impermeable outer shroud containing said plurality of compression molded plates.
Claim 4
Dependent Claim
18 words
A gas filter according to claim 1 wherein said compression molded plates have rectangular front and back faces.
Claim 5
Dependent Claim
24 words
A gas filter according to claim 1 wherein said catalytic metal is selected from the group consisting of chromium, platinum, rhodium, palladium and molybdenum.
Claim 6
Dependent Claim
23 words
A gas filter according to claim 1 wherein said monolithic filter body is contained within and sintered to a gas impermeable outer shroud.
Claim 7
Dependent Claim
33 words
A gas filter according to claim 1 wherein each inlet channel is in alignment with a plurality of outlet channels and each outlet channel is in alignment with a plurality of inlet channels.
Claim 8
Dependent Claim
18 words
A gas filter according to claim 1 wherein said compression molded plates comprise compacted and sintered metal particulates.
Claim 9
Dependent Claim
26 words
A gas filter according to claim 7 wherein said metal particulates are selected from the group consisting of metal powder, metal wire pieces and metal shavings.
Claim 10
Dependent Claim
39 words
A gas filter according to claim 8 wherein said metal wire pieces and metal shavings have a width of from about 0.1 mm to about 5 mm and a length of from about 0.5 mm to about 30 mm.
Claim 11
Dependent Claim
127 words
A gas filter, suitable for removing soot and harmful elements from a combustion exhaust gas stream in heating and incineration plants, which comprises a plurality of identically sized and shaped gas-permeable, highly porous, compression molded and sintered metal plates; each plate having a front face and a back face; each front face containing a plurality of channels positioned between channel-separating walls; each channel having an open end and a closed end provided by a closing cross strut; with adjacent plates of said plurality being positioned with front faces against back faces and with adjacent plates being rotated 180° with respect to each other to provide a head-to-toe arrangement of adjacent plates for providing pluralities of inlet channels alternating with pluralities of outlet channels within said gas filter.
Claim 12
Dependent Claim
127 words
A gas filter, suitable for removing soot and harmful elements from a combustion exhaust gas stream in heating and incineration plants, which comprises a plurality of identically sized and shaped gas-permeable, highly porous, compression molded and sintered metal plates; each plate having a front face and a back face; each front face containing a plurality of channels positioned between channel-separating walls; each channel having an open end and a closed end provided by a closing cross strut; with adjacent plates of said plurality being positioned with front faces against back faces and with adjacent plates being rotated 180° with respect to each other to provide a head-to-toe arrangement of adjacent plates for providing pluralities of inlet channels alternating with pluralities of outlet channels within said gas filter.
Claim 13
Dependent Claim
18 words
A gas filter according to claim 10 further including a gas-impermeable outer shroud containing said plurality of plates.
Claim 14
Dependent Claim
16 words
A gas filter according to claim 10 wherein said plates have rectangular front and back faces.
Claim 15
Dependent Claim
33 words
A gas filter according to claim 10 wherein each inlet channel is in alignment with a plurality of outlet channels and each outlet channel is in alignment with a plurality of inlet channels.
Claim 16
Dependent Claim
16 words
A gas filter according to claim 10 wherein said plates comprise compacted and sintered metal particulates.
Claim 17
Dependent Claim
26 words
A gas filter according to claim 14 wherein said metal particulates are selected from the group consisting of metal powder, metal wire pieces and metal shavings.
Claim 18
Dependent Claim
39 words
A gas filter according to claim 15 wherein said metal wire pieces and metal shavings have a width of from about 0.1 mm to about 5 mm and a length of from about 0.5 mm to about 30 mm.
Claim 19
Dependent Claim
16 words
A gas filter according to claim 10 wherein said compression molded plates comprise a catalytic metal.
Claim 20
Dependent Claim
24 words
A gas filter according to claim 17 wherein said catalytic metal is selected from the group consisting of chromium, platinum, rhodium, palladium and molybdenum.
Claim 21
Dependent Claim
30 words
A gas filter according to claim 10 wherein said plates comprise compacted and sintered metal particulates, and said plurality of plates are sintered together to form a monolithic filter body.
Claim 22
Dependent Claim
23 words
A gas filter according to claim 19 wherein said monolithic filter body is contained within and sintered to a gas impermeable outer shroud.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |