US4201838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated microporous article
Assignee: MPI ACQUISITION CORP A DE CORP
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Filing: 1978-06-16
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Granted: 1980-05-06
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Expires: 1998-06-16
Abstract
Abstract A laminated microporous article consisting of at least two layers or plies, the first comprising either a thermoset or thermoplastic microporous material and the second comprising a polyester non-woven, heat bonded (in distinction of adhesive bonded) web. The resulting laminated microporous article is especially useful as a battery separator and exhibits superior propertries including improved electrical resistance, toughness and tear strength, and flexibility.
Inventors
- 👤 Bruce S. Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:36
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/28; B05D1/40; H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/491; B05D2252/00; B05D2252/02; H01M50/494; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249981; Y10T428/249986; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/676; Y10T442/679
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
As an article of manufacture, a laminated microporous article combination comprising a first layer of microporous material, wherein the micropores are substantially all of a size less than 2 microns and a layer thickness of 2 mils and greater and a second layer of porous backing material laminated to said first layer, said second layer comprising a heat-bonded fibrous polyester non-woven web of a thickness of about 8 mils and greater and an electrical resistance, in a battery acid electrolyte, of about 0.25 mΩ in 2 /mil, said laminate having a total thickness of about 10 to 40 mils for a backweb of a microporous layer and said backing material.
Claim 2
Dependent Claim
110 words
As an article of manufacture, a laminated microporous article combination comprising a first layer of microporous material, wherein the micropores are substantially all of a size less than 2 microns and a layer thickness of 2 mils and greater and a second layer of porous backing material laminated to said first layer, said second layer comprising a heat-bonded fibrous polyester non-woven web of a thickness of about 8 mils and greater and an electrical resistance, in a battery acid electrolyte, of about 0.25 mΩ in 2 /mil, said laminate having a total thickness of about 10 to 40 mils for a backweb of a microporous layer and said backing material.
Claim 3
Dependent Claim
28 words
The invention of claim 1 wherein said first layer of microporous material is selected from the group consisting of a thermoplastic microporous material or a thermoset microporous material.
Claim 4
Dependent Claim
19 words
The invention of claim 2 wherein said thermoplastic microporous material comprises polyvinyl chloride having particles of silica filler therein.
Claim 5
Dependent Claim
19 words
The invention of claim 2 wherein said thermoset microporous material comprises vulcanized rubber having particles of silica filler therein.
Claim 6
Dependent Claim
20 words
The invention of claim 1 wherein said polyester non-woven web has an electrical resistance about 0.25 mΩ in 2 /mil.
Claim 7
Dependent Claim
22 words
The invention of claim 1 wherein the microporous layer of said laminated article has a thickness of about 2 mils or greater.
Claim 8
Dependent Claim
16 words
As an article of manufacture, a battery separator of the laminate as defined in claim 1.
Claim 9
Dependent Claim
51 words
As an article of manufacture, a battery separator of a laminate, as defined in claim 1, whereby the same has improved tensile strength, puncture resistance, and electrical resistance when compared to a battery separator of the same material as said microporous layer and having the same thickness as said laminated article.
Claim 10
Dependent Claim
58 words
The article of manufacture as defined in claim 1 wherein said non-woven web is of a nominal thickness between 8 and 12 mils and resistance in said electrolyte of about 1 mΩ/in 2 in said electrolyte, said laminate having a microporous layer of at least 2 mils thickness with a micropore size of about 2 microns and less.
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |