Laminated battery separator material

Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer – spacer or materials for use therewith

Reexamination Certificate

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Details

C429S254000, C442S361000, C442S364000, C442S381000, C442S389000, C055S486000, C210S483000

Reexamination Certificate

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07063917

ABSTRACT:
A nonwoven material having a laminated construction and including a first layer of nonwoven fibers defining a first surface of the material; a second layer of nonwoven fibers defining the opposite surface of the material; and a third layer of nonwoven fibers located between the first and second layers. The layers are bonded together to form a laminate. At least one of the nonwoven layers comprises a nonwoven web of meltblown fibers. Additionally, one or more of the layers has been rendered permanently hydrophilic by forming the nonwoven web from meltspun fibers of a normally hydrophobic polymer having a hydrophilic melt additive incorporated therein.

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PATENT ABSTRACT—Database WPI, Section Ch, Week 199919, Derwent Publications Ltd., London, GB; AN 1999-220356, XP002215618 & JP11 054101 A (Mitsubishi Paper Mills Ltd.), Feb. 26, 1999.
PATENT ABSTRACT—Database WPI, Section Ch, Week 199744, Derwent Publications Ltd., London, GB; AN 1997-477216, XP002215619 & JP09 223492 A (Daiwabo Co. Ltd.), Aug. 26, 1997.

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