Patent US5290446A successfully refreshed from Google Patents.
US5290446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical wrapped filter element
Assignee: Pall Corp
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Filing: 1992-06-10
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Granted: 1994-03-01
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Expires: 2012-06-10
Abstract
Abstract An element for treating a fluid flowing through the element which comprises at least two filter medium layers helically wrapped around a pervious, hollow tube, with the filter medium layers forming an overall graded pore structure for the fluid treatment element and/or at least one diffusion layer positioned between the filter medium layers.
Inventors
- 👤 Peter J. Degen
- 👤 Colin F. Harwood
- 👤 Clemens C. von Reitzenstein
- 👤 Stephen A. Geibel
- 👤 Raymond T. Friel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:15
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/50; B01D29/56; B01D29/58
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
79 words
An element for treating a fluid flowing through the element, which fluid treatment element comprises at least one filter medium sheet comprising a fibrous mass of nonwoven microfibers capable of removing particulates from a fluid helically wrapped around a pervious, hollow tube to form an overlap of about 0% to about 95% of the width of said filter medium sheet and at least one diffusion layer which allows for lateral flow of said fluid within said fluid treatment element.
Claim 2
Dependent Claim
79 words
An element for treating a fluid flowing through the element, which fluid treatment element comprises at least one filter medium sheet comprising a fibrous mass of nonwoven microfibers capable of removing particulates from a fluid helically wrapped around a pervious, hollow tube to form an overlap of about 0% to about 95% of the width of said filter medium sheet and at least one diffusion layer which allows for lateral flow of said fluid within said fluid treatment element.
Claim 3
Dependent Claim
31 words
The fluid treatment element of claim 1, which element comprises at least two filter medium sheets and at least one diffusion layer positioned between at least two successive filter medium sheets.
Claim 4
Dependent Claim
15 words
The fluid treatment element of claim 2, wherein said tube has a substantially cylindrical cross-section.
Claim 5
Dependent Claim
20 words
The fluid treatment element of claim 3, wherein at least two of said filter medium sheets have different pore ratings.
Claim 6
Dependent Claim
39 words
The fluid treatment element of claim 4, wherein said filter medium sheets having different pore ratings are arranged such that said filter medium sheet pore ratings decrease in the normal direction of fluid flow through said fluid treatment element.
Claim 7
Dependent Claim
18 words
The fluid treatment element of claim 5, wherein said diffusion layers are helically wrapped around said cylindrical tube.
Claim 8
Dependent Claim
24 words
The fluid treatment element of claim 6, wherein said filter medium sheets comprise a fibrous mass of nonwoven fibers secured to said diffusion layers.
Claim 9
Dependent Claim
18 words
The fluid treatment element of claim 7, wherein said filter medium sheets and said diffusion layers comprise polypropylene.
Claim 10
Dependent Claim
34 words
The fluid treatment element of claim 8, wherein said fluid treatment element comprises at least three filter medium sheets and at least one diffusion layer positioned between at least two successive filter medium sheets.
Claim 11
Dependent Claim
57 words
The fluid treatment element of claim 9, wherein said fluid treatment element comprises an innermost filter medium sheet positioned such that said diffusion layer associated therewith is oriented inwardly toward said cylindrical core and at least five additional filter medium sheets positioned such that said diffusion layers associated therewith are oriented outwardly away from said cylindrical core.
Claim 12
Dependent Claim
24 words
The fluid treatment element of claim 3, wherein said filter medium sheets are helically wrapped to form abutting edges of said filter medium sheets.
Claim 13
Dependent Claim
33 words
The fluid treatment element of claim 3, wherein said filter medium sheets are helically wrapped to form an overlap of about 25% to about 75% of the width of said filter medium sheets.
Claim 14
Dependent Claim
30 words
The fluid treatment element of claim 3, wherein said filter medium sheets are helically wrapped to form an overlap of about 67% of the width of said filter medium sheets.
Claim 15
Dependent Claim
30 words
The fluid treatment element of claim 3, wherein said filter medium sheets are helically wrapped to form an overlap of about 50% of the width of said filter medium sheets.
Claim 16
Dependent Claim
17 words
The fluid treatment element of claim 1, wherein said diffusion layer is helically wrapped around said tube.
Claim 17
Dependent Claim
22 words
The fluid treatment element of claim 15, wherein said diffusion layer is helically wrapped to form abutting edges of said diffusion layer.
Claim 18
Dependent Claim
14 words
The fluid treatment element of claim 16, wherein said diffusion layer is a mesh.
Claim 19
Dependent Claim
22 words
The fluid treatment element of claim 1, wherein a diffusion layer is positioned between the innermost filter medium sheet and said tube.
Claim 20
Dependent Claim
22 words
The fluid treatment element of claim 18, which element further comprises a pervious protective layer wrapped around the outermost filter medium sheet.
Claim 21
Dependent Claim
16 words
The fluid treatment element of claim 1, which element comprises at least two filter medium sheets.
Claim 22
Dependent Claim
38 words
The fluid treatment element of claim 20, wherein at least two of said filter medium sheets have different pore ratings and are arranged such that the pores of the filter medium sheets decrease in the radially outward direction.
Claim 23
Dependent Claim
34 words
The fluid treatment element of claim 1, wherein said filter medium sheet comprises a material selected from the group consisting of nylon, aramid, fluoropolymer, polyethylene, polyester, polystyrene, polyurethane, glass, carbon, stainless steel, and aluminum.
Claim 24
Dependent Claim
14 words
The fluid treatment element of claim 22, wherein said filter medium sheet comprises fiberglass.
Claim 25
Dependent Claim
32 words
The fluid treatment element of claim 1, wherein said filter medium is helically wrapped to form an overlap of about 25% to about 75% of the width of said filter medium sheet.
Claim 26
Dependent Claim
29 words
The fluid treatment element of claim 1, wherein said filter medium is helically wrapped to form an overlap of about 67% of the width of said filter medium sheet.
Claim 27
Dependent Claim
29 words
The fluid treatment element of claim 1, wherein said filter medium is helically wrapped to form an overlap of about 50% of the width of said filter medium sheet.
Claim 28
Dependent Claim
87 words
An element for treating a fluid flowing through the element, which fluid treatment element comprises at least one filter medium sheet comprising a fibrous mass of nonwoven microfibers capable of removing particulates from a fluid helically wrapped around a pervious, hollow tube and at least one diffusion layer which allows for lateral flow of said fluid within said fluid treatment element, wherein said diffusion layer is a spun-bonded polypropylene nonwoven sheet material having a weight of between about 20 g/m 2 and about 60 g/m 2 .
Claim 29
Dependent Claim
87 words
An element for treating a fluid flowing through the element, which fluid treatment element comprises at least one filter medium sheet comprising a fibrous mass of nonwoven microfibers capable of removing particulates from a fluid helically wrapped around a pervious, hollow tube and at least one diffusion layer which allows for lateral flow of said fluid within said fluid treatment element, wherein said diffusion layer is a spun-bonded polypropylene nonwoven sheet material having a weight of between about 20 g/m 2 and about 60 g/m 2 .
Claim 30
Dependent Claim
27 words
The fluid treatment element of claim 27, wherein said diffusion layer is a spun-bonded polypropylene nonwoven sheet material having a weight of about 20 g/m 2 .
Claim 31
Dependent Claim
27 words
The fluid treatment element of claim 27, wherein said diffusion layer is a spun-bonded polypropylene nonwoven sheet material having a weight of about 40 g/m 2 .
Claim 32
Dependent Claim
152 words
An element for treating a fluid flowing through the element, which fluid treatment element comprises at least six filter medium sheets helically wrapped around a pervious, hollow, cylindrical tube to form an overlap of 50% of the width of each of said filter medium sheets, wherein each of said filter medium sheets comprises a fibrous mass of nonwoven polypropylene fibers secured to a diffusion layer comprising a porous polypropylene substrate, the innermost of said filter medium sheets is positioned such that said diffusion layer associated therewith is oriented inwardly toward said cylindrical core, the other filter medium sheets are positioned such that said diffusion layers associated therewith are oriented outwardly away from said cylindrical core, and at least three of said filter medium sheets have different pore ratings and are positioned such that said filter medium sheet pore ratings decrease in the normal direction of fluid flow through said fluid treatment element.
Claim 33
Dependent Claim
152 words
An element for treating a fluid flowing through the element, which fluid treatment element comprises at least six filter medium sheets helically wrapped around a pervious, hollow, cylindrical tube to form an overlap of 50% of the width of each of said filter medium sheets, wherein each of said filter medium sheets comprises a fibrous mass of nonwoven polypropylene fibers secured to a diffusion layer comprising a porous polypropylene substrate, the innermost of said filter medium sheets is positioned such that said diffusion layer associated therewith is oriented inwardly toward said cylindrical core, the other filter medium sheets are positioned such that said diffusion layers associated therewith are oriented outwardly away from said cylindrical core, and at least three of said filter medium sheets have different pore ratings and are positioned such that said filter medium sheet pore ratings decrease in the normal direction of fluid flow through said fluid treatment element.
References Cited (Backward Citations)
GB855068A
Cited
US3261473A
Cited
US3268442A
Cited
US3450632A
Cited
US3578175A
Cited
US3769128A
Cited
US3804259A
Cited
US3933557A
Cited
US4112159A
Cited
US4101423A
Cited
GB1543404A
Cited
US4092246A
Cited
US4421646A
Cited
JPS5534143A
Cited
US4235723A
Cited
US4475973A
Cited
EP0095297A1
Cited
US4660779A
Cited
US4692196A
Cited
US4877527A
Cited
US4882056A
Cited
US5039413A
Cited
US4902427A
Cited
US5028465A
Cited
US5122270A
Cited
US5185190A
Cited
US5108604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |