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:
Oct. 17, 2000
Filed:
Nov. 16, 1999
Applicant:
Inventor:
Wei-Ching Yu, Gastonia, NC (US);
Assignee:
Celgard Inc., Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264 461 ; 156160 ; 156227 ;
Abstract
A battery separator is made from a microporous polyolefin membrane having a thickness of less than or equal to 0.5 mil. The separator is made by extruding a parison, collapsing the parison to form a flat sheet comprising two plies, annealing the sheet, stretching the sheet, and winding the sheet.