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:
Jul. 16, 2013
Filed:
Apr. 07, 2010
Ronald W. Call, Rock Hill, SC (US);
Lie Shi, Charlotte, NC (US);
Zhengming Zhang, Charlotte, NC (US);
Shizuo Ogura, Charlotte, NC (US);
Xiangyun Wei, Charlotte, NC (US);
Premanand Ramadass, Charlotte, NC (US);
Ronald W. Call, Rock Hill, SC (US);
Lie Shi, Charlotte, NC (US);
Zhengming Zhang, Charlotte, NC (US);
Shizuo Ogura, Charlotte, NC (US);
Xiangyun Wei, Charlotte, NC (US);
Premanand Ramadass, Charlotte, NC (US);
Celgard LLC, Charlotte, NC (US);
Abstract
A multi-layer microporous battery separator which comprises: a high molecular weight polypropylene layer having a melt flow index of ≦1.2 measured at layer; a polyethylene layer; and a high molecular weight polypropylene layer having a melt flow index of ≦1.2 measured at layer. The resulting microporous battery separator which is formed by a dry stretch process produces the microporous battery separator which has a porosity of ≦37% while maintaining a gurley from 13-25 seconds and a thickness of ≦25 microns.