US6090731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density nonwoven filter media
Assignee: Kimberly Clark Worldwide Inc
•
Filing: 1998-08-05
•
Granted: 2000-07-18
•
Expires: 2018-08-05
Abstract
Abstract The invention provides a sheet filter medium having autogenously bonded uncrimped conjugate fibers which contain a polyolefin and another thermoplastic polymer that have different melting points. The filter medium has a density between about 0.07 g/cm 3 and about 0.2 g/cm 3 . The invention additionally provides a three-dimensionally thermoformed filter medium that has a density between about 0.07 g/cm 3 and about 0.5 g/cm 3 .
Inventors
- 👤 Richard Daniel Pike
- 👤 Kurtis Lee Brown
- 👤 Peter Wyndham Shipp, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:46
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; B; B01; B01D; B01D39/00; B01D39/08; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; D04H1/558; D04H3/00; D04H3/005; D04H3/007; D04H3/08; D04H3/14; D04H3/147; B01D2239/00; B01D2239/02; B01D2239/0216; B01D2239/0233; B01D2239/04; B01D2239/0435; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/0627; B01D2239/064; B01D2239/069; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1291; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/335; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/626; Y10T442/637; Y10T442/638; Y10T442/641; Y10T442/659; Y10T442/66; Y10T442/681; Y10T442/69; Y10T442/692
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
87 words
A filter medium comprising: a first layer comprising a nonwoven web of autogenously bonded uncrimped multicomponent spunbond fibers having a density between about 0.07 g/cm 3 and about 0.2 g/cm 3 wherein said multicomponent spunbond fibers comprise at least a first thermoplastic polymer component and a second thermoplastic polymer component having a melting point difference of at least 5° C. and further wherein said fibers are bonded at fiber cross-over points; and a second layer laminated to said first layer, said second layer comprising a microfiber web.
Claim 2
Dependent Claim
87 words
A filter medium comprising: a first layer comprising a nonwoven web of autogenously bonded uncrimped multicomponent spunbond fibers having a density between about 0.07 g/cm 3 and about 0.2 g/cm 3 wherein said multicomponent spunbond fibers comprise at least a first thermoplastic polymer component and a second thermoplastic polymer component having a melting point difference of at least 5° C. and further wherein said fibers are bonded at fiber cross-over points; and a second layer laminated to said first layer, said second layer comprising a microfiber web.
Claim 3
Dependent Claim
17 words
The filter medium of claim 1 wherein said microfiber web comprises a nonwoven web of meltblown fibers.
Claim 4
Dependent Claim
40 words
The filter medium of claim 2 wherein the first thermoplastic polymer component of said multicomponent spunbond fibers comprises a polymer having a melting point at least about 10° C. lower than the melting point of the second thermoplastic polymer component.
Claim 5
Dependent Claim
30 words
The filter medium of claim 3 wherein said first thermoplastic polymer component comprises a polyolefin selected from the group consisting of polyethylene, polypropylene, polybutylene, polypentene, and blends and copolymers thereof.
Claim 6
Dependent Claim
29 words
The filter medium of claim 4 wherein said second thermoplastic polymer is selected from the group consisting of polyolefins, polycarbonate, polyamides, polyesters, acrylic copolymers, and blends and copolymers thereof.
Claim 7
Dependent Claim
22 words
The filter medium of claim 3 wherein said first thermoplastic polymer component comprises polyethylene and said second thermoplastic polymer component comprises polypropylene.
Claim 8
Dependent Claim
13 words
The filter medium of claim 6 wherein said first layer is electret treated.
Claim 9
Dependent Claim
22 words
The filter medium of claim 3 wherein first thermoplastic polymer component comprises polyethylene and said second thermoplastic polymer component comprises nylon 6.
Claim 10
Dependent Claim
23 words
The filter medium of claim 3 wherein said first thermoplastic polymer component comprises polyethylene and said second thermoplastic polymer component comprises polyethylene terephthalate.
Claim 11
Dependent Claim
19 words
The filter medium of claim 3 wherein said first layer is through-air bonded and is without mechanically compacted regions.
Claim 12
Dependent Claim
27 words
The filter medium of claim 10 wherein said first layer has a density greater than about 0.1 g/cm 3 and less than about 0.15 g/cm 3 .
Claim 13
Dependent Claim
22 words
The filter medium of claim 10 wherein said medium has a Mullen Burst strength of at least about 3.5 kg/cm 2 .
Claim 14
Dependent Claim
14 words
The filter medium of claim 10 wherein said multicomponent spunbond fibers are bicomponent fibers.
Claim 15
Dependent Claim
13 words
The filter medium of claim 10 wherein said medium is three dimensionally shaped.
Claim 16
Dependent Claim
13 words
The filter medium of claim 10 wherein said first layer is electret treated.
Claim 17
Dependent Claim
61 words
The filter medium of claim 1 further comprising a third layer, said third layer comprising an autogenously bonded nonwoven web of multicomponent spunbond fibers comprising at least a first thermoplastic polymer component and a second thermoplastic polymer component having a melting point difference of at least 10° C. and wherein said first layer is disposed between said second and third layers.
Claim 18
Dependent Claim
23 words
The filter medium of claim 16 wherein said first layer of multicomponent spunbond fibers is through-air bonded and is without mechanically compacted regions.
Claim 19
Dependent Claim
23 words
The filter medium of claim 17 wherein said third layer of multicomponent spunbond fibers is through-air bonded and is without mechanically compacted regions.
Claim 20
Dependent Claim
13 words
The filter medium of claim 17 wherein said first layer is electret treated.
Claim 21
Dependent Claim
17 words
The filter medium of claim 18 wherein said microfiber web comprises a nonwoven web of meltblown fibers.
Claim 22
Dependent Claim
43 words
The filter medium of claim 20 wherein the first thermoplastic polymer component of said multicomponent spunbond fibers of said first layer comprises a polymer having a melting point at least about 10° C. lower than the melting point of the second polymer component.
Claim 23
Dependent Claim
42 words
The filter medium of claim 21 wherein said first thermoplastic polymer component of each of said first and third layers comprise a polyethylene polymer and said second thermoplastic polymer component of each of said first and third layers comprise a polypropylene polymer.
Claim 24
Dependent Claim
24 words
The filter medium of claim 21 wherein the first thermoplastic polymer component of each of said first and third layers comprises a polyethylene polymer.
Claim 25
Dependent Claim
19 words
The filter medium of claim 23 wherein the second thermoplastic polymer of said first layer comprises a polypropylene polymer.
Claim 26
Dependent Claim
22 words
The filter medium of claim 23 said second thermoplastic polymer component of each of said first and third layers comprise nylon 6.
Claim 27
Dependent Claim
22 words
The filter medium of claim 23 wherein said second thermoplastic polymer of each of said first and third layers comprises polyethylene terephthelate.
Claim 28
Dependent Claim
41 words
The filter medium of claim 22 wherein said first layer has a density greater than about 0.1 g/cm 3 and less than about 0.15 g/cm 3 and wherein said first layer has a density greater than that of said third layer.
Claim 29
Dependent Claim
23 words
The filter medium of claim 27 wherein said first layer has a Mullen Burst strength of at least about 3.5 kg/cm 2 .
Claim 30
Dependent Claim
13 words
The filter medium of claim 1 wherein said first layer is electret treated.
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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) | 2003-07-18 | 2004-01-17 | 2004-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-18 | 2008-01-17 | 2008-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-18 | 2012-01-17 | 2012-07-18 | $7700.00 | Window Closed / Lapsed |