US Patent No: 5,389,433
Number of patents in Portfolio can not be more than 2000
Battery separator
Stats
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Feb 14, 1995
Issued date -
Apr 1, 1993
filing date -
08/041,115
serial no -
In Force
status
Importance
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Abstract
A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polysulfone polymer and a filler or polysulfone polymer and structure enhancing agent, said sheet product having a fibrous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 60 volume percent composed of pores such that the average pore diameter increases from each major surface toward the interior of the sheet product's thickness.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,286,015 Polyaryl ether sulfone semipermeable membrane and process for producing same | 34 | 1979 | |
| 4,251,605 Dried porous acrylonitrile polymer membrane, process for producing same and separators made therefrom | 8 | 1979 | |
| 4,351,860 Polyaryl ether sulfone semipermeable membrane and process for producing same | 23 | 1981 | |
| 4,481,260 Aromatic polysulfone type resin hollow fiber membrane and process for producing the same | 33 | 1983 | |
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| 4,650,730 Battery separator | 64 | 1985 | |
| 4,731,304 Battery separator | 51 | 1986 | |
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| 4,959,167 Asymmetric disulfides in lubricant compositions | 5 | 1989 | |
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| 4,287,276 Alkaline battery with separator of high surface area | 24 | 1979 | |
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| 4,529,646 Production of composite membranes | 28 | 1984 | |
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| 4,714,663 Sulfonated polysulfone battery membrane for use in corrosive environments | 8 | 1986 | |
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| 4,210,998 Toughening of PVC-separator-enveloped battery plates | 8 | 1978 | |
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| 4,755,299 Multi-layer membrane and the use thereof for the separation of liquid mixtures according to the pervaporation process | 39 | 1985 | |
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| 4,221,846 Battery separator | 10 | 1979 | |
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| 4,776,999 Ultrathin polyether sulfone polymer films and their preparation | 7 | 1986 | |
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| 4,201,838 Laminated microporous article | 25 | 1978 | |
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| 4,957,943 Particle-filled microporous materials | 72 | 1988 | |
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| 4,273,903 Sulphonated polyarylethersulphone copolymers | 36 | 1979 | |
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| 4,681,750 Preparation of amorphous, precipitated silica and siliceous filler-reinforced microporous polymeric separator | 45 | 1986 | |
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| 4,243,562 Process for the polymerization of vinyl chloride in aqueous suspension utilizing an oil-soluble initiator and subsequently a water-soluble initiator and use of the powders obtained thereby | 9 | 1978 | |
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| 4,699,857 Battery separator | 31 | 1986 | |
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| 4,721,568 Semipermeable composite membrane | 8 | 1985 | |