Patent US5597645A successfully refreshed from Google Patents.
US5597645A
Expired / Lapsed
US
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Nonwoven filter media for gas
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1994-08-30
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Granted: 1997-01-28
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Expires: 2014-08-30
Abstract
Abstract The present invention provides a filter medium, which contains an electretized nonwoven web of crimped fibers selected from the group consisting of spunbond filaments and staple fibers, wherein the nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 .
Inventors
- 👤 Richard D. Pike
- 👤 Richard M. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:44
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; D01; D01F; D01F8/00; D01F8/04; D01F8/06; B01D2239/00; B01D2239/02; B01D2239/0208; B01D2239/0216; B01D2239/0225; B01D2239/0233; B01D2239/04; B01D2239/0407; B01D2239/0435; B01D2239/06; B01D2239/0604; B01D2239/0627; B01D2239/064; B01D2239/065; B01D2239/12; B01D2239/1291; Y; Y10; Y10S; Y10S55/00; Y10S55/39; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/611; Y10T442/627; Y10T442/635; Y10T442/637; Y10T442/638; Y10T442/681
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
90 words
A filter medium comprising an electretized nonwoven web of crimped fibers selected from the group consisting of spunbond filaments and staple fibers, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 , and wherein said crimped fibers are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Claim 2
Dependent Claim
90 words
A filter medium comprising an electretized nonwoven web of crimped fibers selected from the group consisting of spunbond filaments and staple fibers, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 , and wherein said crimped fibers are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Claim 3
Dependent Claim
30 words
The filter medium of claim 1 wherein said fibers comprise a fiber-forming thermoplastic polymer with a resistivity greater than about 10 13 ohms-cm, as measured in accordance with ASTM 257-61.
Claim 4
Dependent Claim
35 words
The filter medium of claim 1 wherein said fibers comprise a thermoplastic polymer selected from the group consisting of polyolefins, polyamides, polyesters, polycarbonates, polystyrenes, thermoplastic elastomers, fluoropolymers, vinyl polymers, polyurethane, and blends and copolymers thereof.
Claim 5
Dependent Claim
16 words
The filter medium of claim 1 wherein said fibers are conjugate fibers comprising two thermoplastic polymers.
Claim 6
Dependent Claim
14 words
The filter medium of claim 4 wherein said thermoplastic polymers have different melting points.
Claim 7
Dependent Claim
14 words
The filter medium of claim 5 wherein said thermoplastic polymers have different crystallization properties.
Claim 8
Dependent Claim
14 words
The filter medium of claim 4 wherein said thermoplastic polymers are selected from polyolefins.
Claim 9
Dependent Claim
14 words
The filter medium of claim 4 wherein said thermoplastic polymers are polypropylene and polyethylene.
Claim 10
Dependent Claim
26 words
The filter medium of claim 8 wherein said polyethylene is selected from the group consisting of linear low density polyethylene, high density polyethylene and blends thereof.
Claim 11
Dependent Claim
21 words
The filter medium of claim 1 wherein said nonwoven web has a increasing fiber density toward one of its planar surfaces.
Claim 12
Dependent Claim
12 words
The filter medium of claim 1 wherein said fibers are shaped fibers.
Claim 13
Dependent Claim
34 words
The filter medium of claim 1 further comprises one additional layer of said electretized nonwoven web, forming a top layer and a bottom layer, wherein said top and bottom layers have different Frazier permeabilities.
Claim 14
Dependent Claim
16 words
The filter medium of claim 12 wherein one of said top and bottom layers is pigmented.
Claim 15
Dependent Claim
91 words
A filter medium comprising an electretized nonwoven web of crimped conjugate fibers selected from the group consisting of spunbond filaments and staple fibers, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 , and wherein said crimped fibers are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Claim 16
Dependent Claim
91 words
A filter medium comprising an electretized nonwoven web of crimped conjugate fibers selected from the group consisting of spunbond filaments and staple fibers, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 , and wherein said crimped fibers are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Claim 17
Dependent Claim
13 words
The filter medium of claim 14 wherein said fibers comprise two thermoplastic polymers.
Claim 18
Dependent Claim
17 words
The filter medium of claim 15 wherein said thermoplastic polymers have different melting points and crystallization properties.
Claim 19
Dependent Claim
14 words
The filter medium of claim 15 wherein said thermoplastic polymers are selected from polyolefins.
Claim 20
Dependent Claim
14 words
The filter medium of claim 17 wherein said thermoplastic polymers are polypropylene and polyethylene.
Claim 21
Dependent Claim
21 words
The filter medium of claim 14 wherein said nonwoven web has a increasing fiber density toward one of its planar surfaces.
Claim 22
Dependent Claim
12 words
The filter medium of claim 14 wherein said fibers are shaped fibers.
Claim 23
Dependent Claim
82 words
A fluid filter medium comprising an electretized nonwoven web of crimped conjugate spunbond filaments, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 , and wherein said crimped filaments are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Claim 24
Dependent Claim
82 words
A fluid filter medium comprising an electretized nonwoven web of crimped conjugate spunbond filaments, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft 3 /min/ft 2 and a density between about 0.01 g/cm 3 and about 0.095 g/cm 3 , and wherein said crimped filaments are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Claim 25
Dependent Claim
15 words
The fluid filter medium of claim 21 wherein said conjugate fibers comprise two thermoplastic polymers.
Claim 26
Dependent Claim
17 words
The filter medium of claim 22 wherein said thermoplastic polymers have different melting points and crystallization properties.
Claim 27
Dependent Claim
14 words
The filter medium of claim 22 wherein said thermoplastic polymers are polypropylene and polyethylene.
Claim 28
Dependent Claim
21 words
The filter medium of claim 21 wherein said nonwoven web has a increasing fiber density toward one of its planar surfaces.
Claim 29
Dependent Claim
12 words
The filter medium of claim 21 wherein said fibers are shaped fibers.
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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) | 2000-01-28 | 2000-07-29 | 2001-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-28 | 2004-07-29 | 2005-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-28 | 2008-07-29 | 2009-01-28 | $7700.00 | Window Closed / Lapsed |