US Patent No: 5,480,745

Number of patents in Portfolio can not be more than 2000

Porous film and use of the same

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ATTORNEY / AGENT: (SPONSORED)

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
NITTO DENKO CORPORATIONOSAKA2223

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Higuchi, Hiroyuki Kawasaki, JP 52 170
Matsushima, Ryoichi Nagoya, JP 55 163
Matsushita, Kiichiro Osaka, JP 16 36
Nishiyama, Soji Osaka, JP 21 42

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CELGARD LLC (2)
4,650,730 Battery separator 68 1985
4,731,304 Battery separator 55 1986
 
W.R. GRACE & CO.-CONN. (2)
4,789,609 Battery separator 6 1987
5,362,582 Battery separator 12 1993
 
Ellenberger; Willi (1)
4,181,651 Method for hydrolysis of casein using orthophosphorous acids or salts thereof and montmorillonite 3 1978
 
KURARAY CO., LTD. (1)
4,206,257 Napped sheet material bearing the characteristics of a suede-leather and method of producing the same 7 1978
 
MICROPOROUS PRODUCTS, L.P. (1)
4,201,838 Laminated microporous article 25 1978
 
Minnesota Mining and Manufacturing Company (1)
4,863,792 Multi-layer laminates of microporous films 48 1988
 
NITTO DENKO CORPORATION (1)
5,385,777 Porous film, process for producing the same, and use of the same 12 1993
 
PPG INDUSTRIES OHIO, INC. (1)
4,877,679 Multilayer article of microporous and porous materials 84 1988
 
YUASA CORPORATION (1)
5,320,916 Separator for alkali-zinc battery 2 1992

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CELGARD LLC (2)
6,346,350 Structurally stable fusible battery separators and method of making same 6 1999
8,486,556 Multilayer separator exhibiting improved strength and stability 0 2010
 
NITTO DENKO CORPORATION (2)
5,731,074 Porous film and method of producing the same 7 1997
5,824,430 Separator for battery 4 1997
 
SK INNOVATION CO., LTD. (2)
8,003,204 Microporous polyolefin multi layer film and preparing method thereof 2 2008
8,563,120 Microporous polyolefin multi layer film 0 2011
 
3M INNOVATIVE PROPERTIES COMPANY (1)
5,993,954 Temperature-sensitive microporous film 5 1997
 
ASAHI KASEI CHEMICALS CORPORATION (1)
7,618,743 Microporous polyolefin film 1 2004
 
LG CHEMICAL CO., LTD. (1)
6,830,849 High crystalline polypropylene microporous membrane, multi-component microporous membrane and methods for preparing the same 2 2001