US5681469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-blown filtration media having integrally co-located support and filtration fibers
Assignee: Pall Corp
•
Filing: 1996-07-02
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Granted: 1997-10-28
•
Expires: 2016-07-02
Abstract
Abstract Filtration medium is formed of a mass of nonwoven melt blown support and filtration fibers which are integrally co-located with one another. The support fibers have, on average, relatively larger diameters as compared to the filtration fibers which are integrally co-located therewith. Preferably, the filtration medium is disposed within at least one annular zone of a filtration element, for example, a disposable cylindrical filter cartridge having an axially elongate central hollow passageway which is surrounded by the filtration media. A depth filter cartridge in accordance with the present invention may thus be formed having one or more additional filtration zones (which additional filtration zones may or may not respectively be provided with integrally co-located support fibers) in annular relationship to one another. As a result of the melt blown, nonwoven fiber structure in accordance with the present invention whereby at least one filtration zone is comprised of relatively larger diameter support fibers integrally co-located with relatively smaller diameter filtration fibers, a filter cartridge having a wide range of "engineered" physical properties (e.g., in terms of filtration, pressure drop tolerance and the like) can be provided.
Inventors
- 👤 Steven D. Barboza
- 👤 Charles S. Hoffman, Jr.
- 👤 Clinton V. Kopp
- 👤 Robert J. Schmitt
- 👤 Anthony C. Shucosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:46
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; D04H3/03; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/50; B01D29/56; B01D29/58; D04H3/016; D04H3/08; D04H3/16; B01D2101/00; B01D2101/005; B01D2201/00; B01D2201/52; Y; Y10; Y10S; Y10S264/00; Y10S264/75
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
81 words
Filtration medium comprised of a mass of nonwoven melt blown continuous support and filtration fibers, said support fibers having on average a relatively larger diameter as compared to the diameter of said filtration fibers, wherein said relatively larger diameter support fibers define a random matrix of open areas, and wherein said filtration fibers are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined by said support fibers.
Claim 2
Dependent Claim
81 words
Filtration medium comprised of a mass of nonwoven melt blown continuous support and filtration fibers, said support fibers having on average a relatively larger diameter as compared to the diameter of said filtration fibers, wherein said relatively larger diameter support fibers define a random matrix of open areas, and wherein said filtration fibers are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined by said support fibers.
Claim 3
Dependent Claim
79 words
Filtration medium comprised of a mass of nonwoven melt blown fibers including continuous support fibers having a mean diameter of between about 60 μm to about 500 μm which define a random matrix of open areas, and continuous filtration fibers having a mean diameter of between about 1 μm to about 50 μm which are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined thereby.
Claim 4
Dependent Claim
79 words
Filtration medium comprised of a mass of nonwoven melt blown fibers including continuous support fibers having a mean diameter of between about 60 μm to about 500 μm which define a random matrix of open areas, and continuous filtration fibers having a mean diameter of between about 1 μm to about 50 μm which are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined thereby.
Claim 5
Dependent Claim
24 words
Filtration medium as in claim 1 or 2, wherein at least some of said support and filtration fibers are unitarily fused one to another.
Claim 6
Dependent Claim
22 words
Filtration medium as in claim 1 or 2, wherein said support and filtration fibers are formed of the same or different polymer.
Claim 7
Dependent Claim
47 words
Filtration medium as in claim 4, wherein said support and/or said filtration fibers are formed of a polymer which is selected from the group consisting of polyolefins, polyamides, polyesters, acetals, fluoropolymers, polyphenylene sulfides, biodegradable polymers, liquid crystal polymers, polyetheretherketones, polystyrenes, polymers of vinylidene monomers, and mixtures thereof.
Claim 8
Dependent Claim
25 words
Filtration medium as in claim 1 or 2, wherein said support fibers comprise between about 10 to about 60 wt. % of said filtration medium.
Claim 9
Dependent Claim
87 words
A fluid filter which includes a filtration medium comprised of a mass of nonwoven melt blown continuous support and filtration fibers, said support fibers having on average a relatively larger diameter as compared to the diameter of said filtration fibers, wherein said relatively larger diameter support fibers define a random matrix of open areas, and wherein said filtration fibers are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined by said support fibers.
Claim 10
Dependent Claim
87 words
A fluid filter which includes a filtration medium comprised of a mass of nonwoven melt blown continuous support and filtration fibers, said support fibers having on average a relatively larger diameter as compared to the diameter of said filtration fibers, wherein said relatively larger diameter support fibers define a random matrix of open areas, and wherein said filtration fibers are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined by said support fibers.
Claim 11
Dependent Claim
85 words
A fluid filter which includes a filtration medium comprised of a mass of nonwoven melt blown fibers including continuous support fibers having a mean diameter of between about 60 μm to about 500 μm which define a random matrix of open areas, and continuous filtration fibers having a mean diameter of between about 1 μm to about 50 μm which are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined thereby.
Claim 12
Dependent Claim
85 words
A fluid filter which includes a filtration medium comprised of a mass of nonwoven melt blown fibers including continuous support fibers having a mean diameter of between about 60 μm to about 500 μm which define a random matrix of open areas, and continuous filtration fibers having a mean diameter of between about 1 μm to about 50 μm which are integrally co-located with said relatively larger diameter support fibers so as to be disposed physically within said random matrix of open areas defined thereby.
Claim 13
Dependent Claim
25 words
A fluid filter as in claim 7 or 8, wherein at least some of said support and filtration fibers are unitarily fused one to another.
Claim 14
Dependent Claim
23 words
A fluid filter as in claim 7 or 8, wherein said support and filtration fibers are formed of the same or different polymer.
Claim 15
Dependent Claim
50 words
A fluid filter as in claim 7 or 8, wherein said support and/or said filtration fibers are formed of a polymer which is selected from the group consisting of polyolefins, polyamides, polyesters, acetals, fluoropolymers, polyphenylene sulfides, biodegradable polymers, liquid crystal polymers, polyetheretherketones, polystyrenes, polymers of vinylidene monomers, and mixtures thereof.
Claim 16
Dependent Claim
26 words
A fluid filter as in claim 7 or 8, wherein said support fibers comprise between about 10 to about 60 wt. % of said filtration medium.
Claim 17
Dependent Claim
33 words
A fluid filter as in claim 7 or 8, which is comprised of a plurality of filtration zones, and wherein said filtration medium is included in at least one of said filtration zones.
Claim 18
Dependent Claim
70 words
A filtration medium having at least one filtration zone including continuous support fibers, and continuous filtration fibers which are co-located and intimately entangled with said support fibers, wherein said support fibers have a mean diameter of between about 60 μm to about 500 μm and define a random matrix of open areas, and wherein said filtration fibers have a mean diameter of between about 1 μm to about 50 μm.
Claim 19
Dependent Claim
70 words
A filtration medium having at least one filtration zone including continuous support fibers, and continuous filtration fibers which are co-located and intimately entangled with said support fibers, wherein said support fibers have a mean diameter of between about 60 μm to about 500 μm and define a random matrix of open areas, and wherein said filtration fibers have a mean diameter of between about 1 μm to about 50 μm.
Claim 20
Dependent Claim
27 words
Filtration medium as in claim 14, wherein said support fibers are present in an amount between about 10 to about 60 wt. % of said filtration medium.
Claim 21
Dependent Claim
22 words
Filtration medium as in claim 14, wherein at least some of said support and filtration fibers are unitarily fused one to another.
Claim 22
Dependent Claim
40 words
Filtration medium as in claim 14, which includes another filtration zone comprised of a mass of melt blown, nonwoven filtration fibers which exhibit a different filtration property as compared to the filtration fibers of said at least one filtration zone.
Claim 23
Dependent Claim
18 words
Filtration medium as in claim 17, wherein said another filtration zone is also comprised of said support fibers.
Claim 24
Dependent Claim
27 words
Filtration medium as in claim 18, wherein said support fibers of said at least one and another filtration zones have different diameters as compared to one another.
Claim 25
Dependent Claim
20 words
Filtration medium as in claim 14, wherein said support and filtration fibers are formed of the same or different polymer.
Claim 26
Dependent Claim
48 words
Filtration medium as in claim 20, wherein said support and/or said filtration fibers are formed of a polymer which is selected from the group consisting of polyolefins, polyamides, polyesters, acetals, fluoropolymers, polyphenylene sulfides, biodegradable polymers, liquid crystal polymers, polyetherether ketones, polystyrenes, polymers of vinylidene monomers and mixtures 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) | 2000-10-27 | 2001-04-28 | 2001-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-27 | 2005-04-28 | 2005-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-27 | 2009-04-28 | 2009-10-28 | $7700.00 | Window Closed / Lapsed |