Patent US3890184A successfully refreshed from Google Patents.
US3890184A
Expired / Lapsed
US
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Method of making extruded rib battery separators
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-10-12
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Granted: 1975-06-17
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Expires: 1993-10-12
Abstract
Abstract Ribs are formed on a nonwoven mat to produce a battery separator. The ribs are formed by extruding a foamed polymer onto the nonwoven mat by extruding the foamed polymer through a multihole die as the nonwoven mat follows an arc passing over a mat backup plate. After the ribs have been extruded and the foamed polymer is still soft, the nonwoven mat with the extruded ribs may be passed through a fixed gap such as a pair of calendar rolls to produce a battery separator of uniform thickness.
Inventors
- 👤 Walter A Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:34
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A METHOD FOR FORMING A RIBBED BATTERY SEPARATOR FROM A GAS LAID NONWOVEN MAT OF POLYOLEFIN FIBERS HAVING AN AVERAGE DIAMETER OF LESS THAN 10 MICRONS WHICH COMPRISES: PASSING SAID GAS LAID NONWOVEN MAT OF POLYOFIN FOBERS HAVING AN AVERAGE DIAMETER OF LESS THAN 10 MICRONS THROUGH A FIXED GAP BETWEEN COMPACTING CALENDER ROLLS AND COMPACTING SAID MAT TO A MAXIMUM PORE SIZE OF LESS THAN 40 MICRONS, THEREAFTER PASSING SAID MAT OVER A BACKUP PLATE HAVING A PORTION THAT FOLLOWS AN ARC, AND EXTRUDING A FOAMED MOLTEN THERMOPLASTIC POLYMER THROUGH AMULTIHOLE DIE ONTO SAID MAT TO FORM RIBS ON SAID MAT AS
Claim 2
Independent Claim
103 words
A METHOD FOR FORMING A RIBBED BATTERY SEPARATOR FROM A GAS LAID NONWOVEN MAT OF POLYOLEFIN FIBERS HAVING AN AVERAGE DIAMETER OF LESS THAN 10 MICRONS WHICH COMPRISES: PASSING SAID GAS LAID NONWOVEN MAT OF POLYOFIN FOBERS HAVING AN AVERAGE DIAMETER OF LESS THAN 10 MICRONS THROUGH A FIXED GAP BETWEEN COMPACTING CALENDER ROLLS AND COMPACTING SAID MAT TO A MAXIMUM PORE SIZE OF LESS THAN 40 MICRONS, THEREAFTER PASSING SAID MAT OVER A BACKUP PLATE HAVING A PORTION THAT FOLLOWS AN ARC, AND EXTRUDING A FOAMED MOLTEN THERMOPLASTIC POLYMER THROUGH AMULTIHOLE DIE ONTO SAID MAT TO FORM RIBS ON SAID MAT AS
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein after said ribs have been formed said ribbed mat is passed between a pair of fixed gap calender rolls to provide a battery separator having a uniform overall thickness.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein said polyolefin fibers having an average diameter of less than 10 microns is comprised of a polymer of propylene or polymer of styrene.
Claim 5
Dependent Claim
15 words
The method of claim 3 wherein said foamed molten thermoplastic polymer is comprised of polyolefin.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |