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Patent US4812145A successfully refreshed from Google Patents.
US4812145A
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US
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Process for the production of a battery separator
Assignee: Lydall Inc
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Filing: 1988-03-25
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Granted: 1989-03-14
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Expires: 2008-03-25
Abstract
Abstract In an alkaline dry cell battery separator being a laid mat of non-dissolvable polyvinyl alcohol fibers held together by a matrix of dissolved or partially dissolved dissolvable polyvinyl alcohol fibers, the improvement comprising the mat having up to 85% of cellulosic fibers relatively uniformly distributed in and among the non-dissolvable polyvinyl alcohol fibers and held therein by said matrix.
Inventors
- 👤 Robert J. LaBonte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:51
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/429; H01M50/4295; H01M50/44; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
A process for the production of an alkaline dry cell battery separator being a laid mat of non-dissolvable polyvinyl alcohol fibers and cellulosic fibers held together by a matrix of dissolved dissolvable polyvinyl alcohol fibers comprising: (a) mixing the said non-dissolvable polyvinyl alcohol fibers, dissolvable polyvinyl alcohol fibers and cellulosic fibers in a solvent liquid until a relatively uniform mixture of the cellulosic fibers in the said non-dissolvable fibers is achieved and the said dissolvable fibers are dissolved; (b) forming a mat of the said fibers in the mixture; and (c) drying the mat to a shape-sustaining form.
Claim 2
Dependent Claim
98 words
A process for the production of an alkaline dry cell battery separator being a laid mat of non-dissolvable polyvinyl alcohol fibers and cellulosic fibers held together by a matrix of dissolved dissolvable polyvinyl alcohol fibers comprising: (a) mixing the said non-dissolvable polyvinyl alcohol fibers, dissolvable polyvinyl alcohol fibers and cellulosic fibers in a solvent liquid until a relatively uniform mixture of the cellulosic fibers in the said non-dissolvable fibers is achieved and the said dissolvable fibers are dissolved; (b) forming a mat of the said fibers in the mixture; and (c) drying the mat to a shape-sustaining form.
Claim 3
Dependent Claim
10 words
The process of claim 1, wherein the solvent is water.
Claim 4
Dependent Claim
20 words
The process of claim 2, wherein the temperature of the water of the mixture is between 50° and 120° F.
Claim 5
Dependent Claim
41 words
The process of claim 1, wherein the said mixing is such that upon drying the mat the dissolved polyvinyl alcohol produces a shape-sustaining matrix for the remaining fibers and the matrix is sufficient to allow cutting and shaping of the mat.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the ratio of the said non-dissolvable fiber to said dissolvable fibers is from about 9:1 to 1.5:1.
Claim 7
Dependent Claim
12 words
The process of claim 5, wherein the said ratio is about 3.5:1.
Claim 8
Dependent Claim
18 words
The process of claim 1, wherein the non-dissolvable fibers have an average denier of about 0.5 to 3.
Claim 9
Dependent Claim
15 words
The process of claim 7 wherein the said denier is from about 0.5 to 1.
Claim 10
Dependent Claim
18 words
The process of claim 1, wherein the non-dissolvable fibers have an average length of at least 3 mm.
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein the said mixture contains up to about 60% of cellulosic fibers.
Claim 12
Dependent Claim
21 words
The process of claim 10, wherein the said mixture has at least 10% and up to 40% of cellulosic fibers therein.
Claim 13
Dependent Claim
24 words
The process of claim 1, wherein the cellulosic fibers have an average denier and staple length no greater than that of natural cotton fibers.
Claim 14
Dependent Claim
23 words
The process of claim 1, wherein the cellulosic fibers have an average staple length no greater than one-half that of natural cotton fibers.
Claim 15
Dependent Claim
19 words
The process of claim 1, wherein the cellulosic fibers are natural cellulosic fibers or wood or plant pulp fibers.
Claim 16
Dependent Claim
13 words
The process of claim 14, wherein the cellulosic fibers are cotton linter fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |