US3765948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rewettable battery separator
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1971-06-03
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Granted: 1973-10-16
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Expires: 1991-06-03
Abstract
Abstract A nonwoven mat of polyolefin fiber is contacted with a gaseous sulfur dioxide-chlorine mixture to sulfo-chlorinate the surface of the polyolefin fibers and then treated with an amine, either after compacting the mat or before compacting the mat to form a structure suitable as a battery separator.
Inventors
- 👤 B Johnson
- 👤 T Huff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:51
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/403; H01M50/406; H01M50/411; H01M50/414; H01M50/417; H01M50/489; H01M50/491; H01M2300/00; H01M2300/0002; H01M2300/0005; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A process according to claim 1 wherein said nonwoven mat is compacted to form a rigid structure having a maximum pore size of less than 40 microns before contacting said nonwoven mat with said sulfur dioxide-chlorine mixture.
Claim 2
Dependent Claim
34 words
A process according to claim 1 wherein said nonwoven mat is compacted to form a rigid structure having a maximum pore size of less than 40 microns after treating said mat with an amine.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein said nonwoven structure is made of polypropylene fibers.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein said nonwoven mat is contacted for at least 3 minutes with about a 50-50 mixture of sulfur dioxide and chlorine.
Claim 5
Dependent Claim
22 words
A process according to claim 5 wherein said nonwoven structure is made of polypropylene fibers having diameters between 1 and 10 microns.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein said ultraviolet light emanates from a fluorescent light source.
Claim 7
Dependent Claim
11 words
A process according to claim 2 wherein said amine is tet-raethylenepentaamine.
Claim 8
Dependent Claim
12 words
A rewettable battery separator prepared according to the process of claim 1.
Claim 9
Dependent Claim
22 words
A wettable battery separator prepared according to the process of claim 1 wherein said polyolefin is polypropylene and said amine is tetraethylenepentaamine.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |