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:
Apr. 23, 2013
Filed:
May. 07, 2008
Applicants:
Yasushi Usami, Nagahama, JP;
Takeyoshi Yamada, Shiga, JP;
Jun Takagi, Shiga, JP;
Inventors:
Assignee:
Mitsubishi Plastics, Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01M 2/14 (2006.01); B32B 5/18 (2006.01); B32B 5/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A laminated porous film having a shutdown (SD) property and a high breakdown (BD) property combined includes at least two layers, which are a porous membrane layer (A layer) having a thickness of 10 μm or greater other than non-woven fabric and a non-woven fabric layer (B layer) having a fiber diameter of 1 μm or less. A value of the ratio (AP/AP) between air permeability when heating at a heating temperature of 150° C. to 200° C. for three minutes (AP) and air permeability prior to heating (AP) is 10 or greater at any heating temperature between 150° C. and 200° C.