Patent US5158844A successfully refreshed from Google Patents.
US5158844A
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US
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Battery separator
Assignee: AHLSTROM DEXTER LLC
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Filing: 1991-03-07
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Granted: 1992-10-27
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Expires: 2011-03-07
Abstract
Abstract A battery separator in the form of a nonwoven fibrous web of water dispersible fibers incorporates up to 65% by weight of fibers having a high cross-sectional aspect ratio. The high aspect ratio fibers include collapsible hollow fibers and ribbon fibers that have a width five to ten times greater than their thickness. These fibers provide reduced thickness at the same basis weight and a synergistic reduction in shrinkage when combined with lower denier solid fibers.
Inventors
- 👤 Vicky L. Hagens
- 👤 Richard P. James
- 👤 Vaughan R. Annis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:31
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/44; H01M50/429; H01M50/4295; H01M50/489; H01M50/491; H01M50/494; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
59 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersible fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water-dispersible fibers include at least 5 percent by weight of synthetic fibers having a cross-sectional aspect ratio of greater than 2 uniformly distributed throughout the nonwoven web.
Claim 2
Dependent Claim
59 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersible fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water-dispersible fibers include at least 5 percent by weight of synthetic fibers having a cross-sectional aspect ratio of greater than 2 uniformly distributed throughout the nonwoven web.
Claim 3
Dependent Claim
16 words
The separator of claim 1 wherein a major portion of the water dispersible fibers is cellulosic.
Claim 4
Dependent Claim
16 words
The separator of claim 1 wherein a major portion of the water dispersible fibers is synthetic.
Claim 5
Dependent Claim
20 words
The separator of claim 1 wherein the high cross-sectional aspect fibers constitute up to 100% of the water dispersible fibers.
Claim 6
Dependent Claim
36 words
The separator of claim 1 wherein the water dispersible fibers are a mixture of cellulosic and synthetic fibers, said high cross-sectional aspect fibers comprising 5-60% by weight of the total fiber content of the nonwoven web.
Claim 7
Dependent Claim
22 words
The separator of claim 5 wherein the web has a thickness increase of substantially less than 10 percent in a alkaline environment.
Claim 8
Dependent Claim
23 words
The separator of claim 1 wherein said high aspect fibers are selected from the group consisting of ribbon fibers and collapsed hollow fibers.
Claim 9
Dependent Claim
26 words
The separator of claim 1 wherein the high aspect fibers are collapsed hollow fibers and comprise 10% to 45% of the fiber content of the web.
Claim 10
Dependent Claim
24 words
The separator of claim 1 wherein the high aspect fibers have a width to thickness ratio in a range extending from 2 to 20.
Claim 11
Dependent Claim
26 words
The separator of claim 1 wherein the high aspect fibers are cellulosic fibers having a width to thickness ratio greater than 2 and less than 10.
Claim 12
Dependent Claim
32 words
The separator of claim 1 wherein the high aspect fibers have a denier in the range of 0.5 to 15 dpf. and a length within the range of 2 to 30 mm.
Claim 13
Dependent Claim
24 words
The separator of claim 1 wherein the binder constitutes less than 30% by weight of the nonwoven web and is comprised of binder fibers.
Claim 14
Dependent Claim
13 words
The separator of claim 1 wherein the binder is a soluble thermoplastic material.
Claim 15
Dependent Claim
17 words
The separator of claim 1 wherein the binder constitutes 3 to 20% by weight of the web.
Claim 16
Dependent Claim
26 words
The separator of claim 1 wherein the web has a thickness of less than 10 mils and an average pore size of less than 100 microns.
Claim 17
Dependent Claim
85 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersable fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water dispersable fibers include regular fibers and at least five percent by weight of high cross-sectional aspect ratio fibers of the same composition uniformly distributed throughout the nonwoven web, the high aspect ratio fibers being collapsed hollow fibers and the regular fibers being of a lower denier than the high aspect ratio fibers.
Claim 18
Dependent Claim
85 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersable fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water dispersable fibers include regular fibers and at least five percent by weight of high cross-sectional aspect ratio fibers of the same composition uniformly distributed throughout the nonwoven web, the high aspect ratio fibers being collapsed hollow fibers and the regular fibers being of a lower denier than the high aspect ratio 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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |