Porous film and use of the same

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5480745
SERIAL NO

08381395

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A porous film, a process for producing the same, a battery separator comprising the porous film, and a battery having incorporated therein the separator are disclosed. The porous film comprises a polyethylene and a polypropylene as the essential components, wherein the polyethylene content in the total weight of polyethylene and polypropylene is from 2 to 40% by weight and the polyethylene content is changed in the direction of the thickness of the film, and is produced by forming a laminate film comprising at least one polypropylene layer and at least one layer of a mixture of polyethylene and polypropylene as the essential components, the polyethylene content in the film being from 2 to 40% by weight, uniaxially stretching the laminate film at a low-temperature range of from -20.degree. C. to 80.degree. C. and then stretching the film at a high-temperature range of from 90.degree. C. to 150.degree. C.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NITTO DENKO CORPORATIONOSAKA2184

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Higuchi, Hiroyuki Osaka, JP 47 248
Matsushima, Ryoichi Osaka, JP 40 287
Matsushita, Kiichiro Osaka, JP 15 60
Nishiyama, Soji Osaka, JP 13 90

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MINNESOTA MINING AND MANUFACTURING COMPANY (1)
* 4863792 Multi-layer laminates of microporous films 56 1988
 
NITTO DENKO CORPORATION (1)
* 5385777 Porous film, process for producing the same, and use of the same 22 1993
 
PPG INDUSTRIES OHIO, INC. (1)
* 4877679 Multilayer article of microporous and porous materials 85 1988
 
Celgard Inc. (1)
* 4650730 Battery separator 80 1985
 
CELGARD, LLC (1)
* 4731304 Battery separator 60 1986
 
W. R. GRACE & CO.-CONN. (2)
* 4789609 Battery separator 6 1987
* 5362582 Battery separator 15 1993
 
YUASA CORPORATION (1)
* 5320916 Separator for alkali-zinc battery 2 1992
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
SK INNOVATION CO., LTD. (4)
8003204 Microporous polyolefin multi layer film and preparing method thereof 2 2008
* 2009/0169,862 Microporous polyolefin multi layer film and preparing method thereof 5 2008
8563120 Microporous polyolefin multi layer film 0 2011
8801984 Microporous polyolefin multi layer film and preparing method thereof 0 2011
 
NITTO DENKO CORPORATION (2)
* 5731074 Porous film and method of producing the same 10 1997
* 5824430 Separator for battery 7 1997
 
3M INNOVATIVE PROPERTIES COMPANY (1)
* 5993954 Temperature-sensitive microporous film 20 1997
 
SONY CORPORATION (1)
* 2009/0208,842 SEPARATOR, METHOD FOR MANUFACTURING SEPARATOR, AND NONAQUEOUS ELECTROLYTE BATTERY 4 2009
 
Celgard Inc. (1)
9112214 Battery separator and method of making same 0 2007
 
CELGARD, LLC (4)
6346350 Structurally stable fusible battery separators and method of making same 7 1999
* 2005/0031,943 Battery separator and method of making same 5 2003
8486556 Multilayer separator exhibiting improved strength and stability 0 2010
9455432 Multilayer hybrid battery separators for lithium ion secondary batteries and methods of making same 0 2014
 
LG CHEMICAL CO., LTD. (1)
6830849 High crystalline polypropylene microporous membrane, multi-component microporous membrane and methods for preparing the same 4 2001
 
BANK OF AMERICA, N.A. (1)
* 2007/0148,538 BATTERY SEPARATOR AND METHOD OF MAKING SAME 2 2007
 
TORAY INDUSTRIES, INC. (2)
8709640 Multi-layer, microporous polyolefin membrane, its production method, battery separator and battery 3 2008
* 2010/0295,511 MULTI-LAYER, MICROPOROUS POLYOLEFIN MEMBRANE, ITS PRODUCTION METHOD, BATTERY SEPARATOR AND BATTERY 6 2008
 
ASAHI KASEI CHEMICALS CORPORATION (1)
7618743 Microporous polyolefin film 3 2004
* Cited By Examiner