US5122270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge or filter module consisting of flexible deep filter material
Assignee: Pall Filtersystems GmbH
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Filing: 1990-04-09
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Granted: 1992-06-16
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Expires: 2010-04-09
Abstract
Abstract A filter cartridge with a filter element inserted in a receiving space formed by a central cylindrical flow pipe 32 and a peripheral wall 34 is in terms of its possibilities of use and possibilities of adaptation to filtration problems substantially improved in that the filter element consists of fleece-like filter material and in that in its radial direction it comprises mutually enclosing zones of different filtering properties. For practical purposes, these zones can follow one another without any transition or they may be constructed with filtering properties which are varied in stepwise fashion. The filter element can be formed by the combination of a pleated filter fleece with a rolled-up filter fleece, the pleated part of the filter element being optionally on the inside or the outside. A rolled-up filter element or the rolled-up part of a filter element may be produced from a strip of fleece-like filter material, the said strip possibly having filtering properties which over its length are varied continuously or from portion to portion.
Inventors
- 👤 Helmut Ruger
- 👤 Massoud Karbachsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:55
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/50; B01D29/56; B01D29/58; B01D2201/00; B01D2201/18; B01D2201/182; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0672; B01D2239/0681; B01D2239/069; B01D2239/0695
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said filter element (10, 13) being characterized by a cationic adsorption characteristic which varies in a radial direction.
Claim 2
Dependent Claim
148 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said filter element (10, 13) being characterized by a cationic adsorption characteristic which varies in a radial direction.
Claim 3
Dependent Claim
148 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said filter element (10, 13) being characterized by a cationic adsorption characteristic which varies in a radial direction.
Claim 4
Dependent Claim
148 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said filter element (10, 13) being characterized by a cationic adsorption characteristic which varies in a radial direction.
Claim 5
Dependent Claim
151 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said mutually-surrounding zones comprising one zone (14) having a pleated filter fleece, and another zone (15) having a wound filter fleece.
Claim 6
Dependent Claim
151 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said mutually-surrounding zones comprising one zone (14) having a pleated filter fleece, and another zone (15) having a wound filter fleece.
Claim 7
Dependent Claim
169 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said mutually-surrounding zones comprising two radially consecutive zones, one radially-inner zone (14) comprising pleated filter fleece, and the other radially outer zone (15) being formed from an encircling layer of filter fleece wound around the radially inner zone (14).
Claim 8
Dependent Claim
169 words
A filter cartridge for filtering a fluid medium, comprising in combination an annular wall structure (34) having flow-through apertures and having a central flow passage surrounded by said wall structure, an end cap (36) connected to said wall structure, and a substantially annular filter element (10, 13) disposed within said annular wall structure (34), said fluid medium being adapted to flow radially through said annular filter element and said end cap sealingly engaging the end of said filter element against leakage, said filter element (10, 13) comprising layers of a strip of filter medium fleece (20) wound into a spiral shape, said strip having an essentially continuous density gradient absent of transition along its length whereby the filter element in radial directions has different filtering properties in mutually surrounding zones, said mutually-surrounding zones comprising two radially consecutive zones, one radially-inner zone (14) comprising pleated filter fleece, and the other radially outer zone (15) being formed from an encircling layer of filter fleece wound around the radially inner zone (14).
Claim 9
Dependent Claim
32 words
The invention as set forth in claim 4, wherein the said two radially consecutive zones have differing filtering properties as a consequence of differences in the structure of the filter medium fleece.
Claim 10
Dependent Claim
32 words
The invention as set forth in claim 4, wherein the said two radially consecutive zones have differing filtering properties as a consequence of differences in the material of the filter medium fleece.
References Cited (Backward Citations)
GB600208A
Cited
US2742160A
Cited
GB1199005A
Cited
US3450632A
Cited
US3521429A
Cited
GB1271867A
Cited
GB1395399A
Cited
US4112159A
Cited
GB1554070A
Cited
US4233042A
Cited
US4239627A
Cited
EP0053879A2
Cited
US4983193A
Cited
GB2152471A
Cited
US4600562A
Cited
US4759782A
Cited
US4714647A
Cited
US4863602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |