US5298046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diesel particulate filter element and filter
Assignee: 3M Co
•
Filing: 1993-01-06
•
Granted: 1994-03-29
•
Expires: 2013-01-06
Abstract
Abstract An efficient, economical, compact diesel particulate filter element in the form of a spiral roll. The filtering element is useful as a filtering element in a diesel particulate filter.
Inventors
- 👤 Joseph C. Peisert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:59
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/0218; B; B01; B01D; B01D39/00; B01D39/10; B01D39/12; B01D39/14; B01D39/20; B01D39/2068; B01D39/2082; B01D46/00; B01D46/10; B01D46/12; F01N3/022; F01N3/0222; F01N3/0226; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/069; B01D2239/0695; B01D2239/12; B01D2239/1233; F01N2330/00; F01N2330/10; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
199 words
A spirally wound filtering element for a diesel particulate filter, said filter element comprising: (i) a plurality of layers of filter material comprising inorganic fibers, said plurality of layers being wound to provide a spirally wound roll, each layer extending substantially the full axial dimension of said spirally wound roll; (ii) a plurality of layers of open mesh material each having widths less than the widths of said layers of filter material and are alternately interposed between successive layers of said filter material, said open mesh material positioned between opposite sides of said spirally wound roll to provide spiral inlet and outlet exhaust channels opening into said spirally wound roll from alternate sides of said roll, each layer of filter material extending beyond said layers of open mesh material to close each of the radially inner and outer ends of said spiral channels; and (iii) a resilient stuffer strip extending between one side of said roll and an interior edge of each of said layers of open mesh material, such that each spiral channel is blocked so that exhaust entering said exhaust inlet channel passes radially through said layers of filter material before exiting through said exhaust outlet channel.
Claim 2
Dependent Claim
199 words
A spirally wound filtering element for a diesel particulate filter, said filter element comprising: (i) a plurality of layers of filter material comprising inorganic fibers, said plurality of layers being wound to provide a spirally wound roll, each layer extending substantially the full axial dimension of said spirally wound roll; (ii) a plurality of layers of open mesh material each having widths less than the widths of said layers of filter material and are alternately interposed between successive layers of said filter material, said open mesh material positioned between opposite sides of said spirally wound roll to provide spiral inlet and outlet exhaust channels opening into said spirally wound roll from alternate sides of said roll, each layer of filter material extending beyond said layers of open mesh material to close each of the radially inner and outer ends of said spiral channels; and (iii) a resilient stuffer strip extending between one side of said roll and an interior edge of each of said layers of open mesh material, such that each spiral channel is blocked so that exhaust entering said exhaust inlet channel passes radially through said layers of filter material before exiting through said exhaust outlet channel.
Claim 3
Dependent Claim
40 words
A spirally wound filtering element as defined in claim 1 comprising two layers of said inorganic filter material, each of which is approximately equal thickness, and two layers of said open mesh material, wherein said open mesh material is corrugated.
Claim 4
Dependent Claim
47 words
A diesel particulate filter comprising (a) a tubular casing having two ends; (b) means for connecting said ends of said casing to an exhaust system; and (c) a spirally wound filtering element as defined in claim 1, said spirally wound filtering element substantially filling said casing radially.
Claim 5
Dependent Claim
34 words
A diesel particulate filter as defined in claim 3 having an outermost filter spiral channel and having an outermost layer of filter material extending radially approximately a full convolution beyond said outermost spiral channel.
Claim 6
Dependent Claim
18 words
A diesel particulate filter as defined in claim 3 wherein said open mesh material comprises knitted metal wires.
Claim 7
Dependent Claim
32 words
A diesel particulate filter as defined in claim 5 wherein said knitted metal wires are stainless steel and have a diameter in the range from about 0.2 mm to about 0.5 mm.
Claim 8
Dependent Claim
23 words
A diesel particulate filter as defined in claim 3 wherein said open mesh material has an openness of at least 80% by volume.
Claim 9
Dependent Claim
16 words
A diesel particulate filter as defined in claim 3 wherein said open mesh material is corrugated.
Claim 10
Dependent Claim
46 words
A diesel particulate filter as defined in claim 3 further comprising a screen interposed at each interface between a filter layer and a layer of open mesh material having a thickness in the range from about 4 to about 20 times the thickness of said screen.
Claim 11
Dependent Claim
20 words
A diesel particulate filter as defined in claim 9 wherein said screen has an open area of at least 20%.
Claim 12
Dependent Claim
27 words
A diesel particulate filter as defined in claim 10 wherein said screen is selected from the group consisting of perforated metal sheets, wire networks, and ceramic fabrics.
Claim 13
Dependent Claim
17 words
A diesel particulate filter as defined in claim 10 wherein said screen is an expanded metal sheet.
Claim 14
Dependent Claim
16 words
A diesel particulate filter as defined in claim 9 wherein said screen comprises knitted metal wires.
Claim 15
Dependent Claim
26 words
A diesel particulate filter as defined in claim 13 wherein said screen comprises a sleeve and said sleeve encompasses one of said layers of filter material.
Claim 16
Dependent Claim
22 words
A diesel particulate filter as defined in claim 3 wherein said stuffer chip comprises a layer of filter material comprising inorganic fibers.
Claim 17
Dependent Claim
45 words
A diesel particulate filter as defined in claim 15 wherein at least one of said filter layers or said stuffer strips includes up to about 25% by volume heat-fugitive fiber(s), based on the total fibrous mass of said at least one of said filter layers.
Claim 18
Dependent Claim
26 words
A diesel particulate filter as defined in claim 3 wherein there are two layers of said filter material and two layers of said open mesh material.
Claim 19
Dependent Claim
50 words
A diesel particulate filter as defined in claim 3 wherein said casing is cylindrical and has an inside diameter in the range from about 7 to about 20 cm, and wherein each layer of open mesh material has a thickness in the range from about 2 to about 10 mm.
Claim 20
Dependent Claim
20 words
A diesel particulate filter as defined in claim 3 wherein each of said layers of filter material comprises inorganic fibers.
Claim 21
Dependent Claim
39 words
A diesel particulate filter as defined in claim 3 wherein said stuffer strip is about equal in width to the difference between the axial dimension of said layer of open mesh material and said layer of said filter material.
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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) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |