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Patent US4277547A successfully refreshed from Google Patents.
US4277547A
Expired / Lapsed
US
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Alkaline battery spearator
Assignee: The AT&T MVPD Group LLC
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Filing: 1980-03-10
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Granted: 1981-07-07
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Expires: 2000-03-10
Abstract
Abstract Substrates prepared from chemically inert organic fibers that are non-wettable are rendered wettable by mechanically attached coatings of hydrophilic inorganic particles. The resulting inorganic-organic composites are suitable for use as separators in alkaline storage cells.
Inventors
- 👤 Scott A. Verzwyvelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:23
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/411; H01M50/414; H01M50/417; H01M50/426; H01M50/489; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
An alkaline storage cell separator that is gas permeable, structurally strong, chemically inert, with respect to aqueous alkaline electrolyte solutions, thermally stable and wettable in aqueous alkaline electrolyte solutions comprising a fabric felt of chemically inert organic fibers and porous inert inorganic metal oxide particles, wherein said fibers are characterized by non-wettable cutter surfaces which form intertestices at irregular intervals throughout said felt and wherein said oxide particles are sintered onto said surfaces to thereby form a wettable granular second surface which provides a means for retaining said electrolyte while allowing ions and gases to pass through said intertestices.
Claim 2
Dependent Claim
99 words
An alkaline storage cell separator that is gas permeable, structurally strong, chemically inert, with respect to aqueous alkaline electrolyte solutions, thermally stable and wettable in aqueous alkaline electrolyte solutions comprising a fabric felt of chemically inert organic fibers and porous inert inorganic metal oxide particles, wherein said fibers are characterized by non-wettable cutter surfaces which form intertestices at irregular intervals throughout said felt and wherein said oxide particles are sintered onto said surfaces to thereby form a wettable granular second surface which provides a means for retaining said electrolyte while allowing ions and gases to pass through said intertestices.
Claim 3
Dependent Claim
28 words
A separator of claim 1 wherein said organic fibers are selected from the group comprised of tetrafluoroethylene, fluorinated ethylene propylene, chlorotrifluoroethylene, polyvinyl fluoride, polyvinyldene fluoride, polyethylene, and polypropylene.
Claim 4
Dependent Claim
13 words
A separator of claim 2 wherein said felt is comprised of polypropylene fibers.
Claim 5
Dependent Claim
11 words
A separator of claim 3 wherein said particles are zirconium oxide.
Claim 6
Dependent Claim
28 words
A storage cell separator in accordance with claim 1 wherein said inorganic particles are selected from the group consisting of zirconium oxide, potassium titanium and thorium oxide particles.
Claim 7
Dependent Claim
17 words
A storage cell separator in accordance with claim 1 wherein said felt is comprised of tetrafluoroethylene fibers.
Claim 8
Dependent Claim
13 words
The separator of claim 6 wherein said inorganic particles are zirconium oxide particles.
References Cited (Backward Citations)
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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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |