The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1998
Filed:
Jan. 17, 1997
Applicant:
Inventors:
Soji Nishiyama, Osaka, JP;
Hiroyuki Higuchi, Osaka, JP;
Kiichiro Matsushita, Osaka, JP;
Yutaka Kishii, Osaka, JP;
Ryoichi Matsushima, Osaka, JP;
Assignee:
Nitto Denko Corporation, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; H01H / ;
U.S. Cl.
CPC ...
4283159 ; 428137 ; 4283166 ; 4283157 ; 429145 ; 429254 ; 264 41 ; 264154 ; 2642356 ;
Abstract
A porous film of a laminate structure, comprising a porous inner layer comprising polyethylene as the essential component, and having formed on both surfaces thereof a porous outer layer comprising polypropylene and having a Vickers hardness of 10 or more. The porous film is suitable as a separator for a lithium battery, and when the porous film is superposed with a positive electrode and a negative electrode, the film is difficult to be scratched and perforated at the assembly of cells. A production method of the porous film is also provided.