Patent US3907604A successfully refreshed from Google Patents.
US3907604A
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US
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Nonwoven mat battery separators
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-10-17
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Granted: 1975-09-23
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Expires: 1992-10-17
Abstract
Abstract The strip tensile strength of nonwoven mat battery separators of polypropylene fibers having a diameter from about 1 to about 10 microns is increased, for example, to strengths greater than 4,000 m, by fuse-bonding, as by calendering or point-bonding, at least a portion of the fibers of the mat at temperatures within the range from about 250*F to about 325*F, preferably, from about 280*F to about 315*F, while the mat is subjected to pressure sufficient to prevent shrinkage of the fibers in the mat.
Inventors
- 👤 James S Prentice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:41
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; H; H01; H01M; H01M50/00; H01M50/40; H01M50/463; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
IN A BATTERY, A POSITIVE PLATE, A NEGATIVE PLATE AND A NONWOVEN MAT OF POLYPROPYLENE FIBERS, SAID NONWOVEN MAT POSITIONED BEWEEN AND SEPARATINGSAID POSITIVE AND SAID NEGATIVE PLATES AND SAID NONWOVEN MAT HAVING POLYPROPYLENE FIBERS HAVING DIAMETERS FROM ABOUT 1 TO ABOUT 10 MICRONS, SAID MAT HAVING FUUSION-BONDS THROUHOUT ITS THICKNESS, THE STRIP TENSILE STREGTH OF THE MAT BEING GREATER THAN ABOUT 4.000M AND THE TEAR RESISTANCE OF THE MAT BEING NO NO GREATER THAN ABOUT 3,000DM2
Claim 2
Dependent Claim
77 words
IN A BATTERY, A POSITIVE PLATE, A NEGATIVE PLATE AND A NONWOVEN MAT OF POLYPROPYLENE FIBERS, SAID NONWOVEN MAT POSITIONED BEWEEN AND SEPARATINGSAID POSITIVE AND SAID NEGATIVE PLATES AND SAID NONWOVEN MAT HAVING POLYPROPYLENE FIBERS HAVING DIAMETERS FROM ABOUT 1 TO ABOUT 10 MICRONS, SAID MAT HAVING FUUSION-BONDS THROUHOUT ITS THICKNESS, THE STRIP TENSILE STREGTH OF THE MAT BEING GREATER THAN ABOUT 4.000M AND THE TEAR RESISTANCE OF THE MAT BEING NO NO GREATER THAN ABOUT 3,000DM2
Claim 3
Dependent Claim
21 words
The battery of claim 1 wherein said fusion-bonds of said nonwoven mat occur in an essentially spaced pattern in said mat.
Claim 4
Dependent Claim
22 words
The battery of claim 2 wherein said fusion-bonds of said nonwoven mat occur continuously in an essentially unbroken pattern in said mat.
Claim 5
Dependent Claim
22 words
The battery of claim 3 wherein said mat has a thickness within the range of from about 1 to about 25 mils.
References Cited (Backward Citations)
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US3276944A
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US3354247A
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US3650866A
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US3704198A
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US3715251A
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |