| http://www.w3.org/ns/prov#value | - than 300,000 and a 10 to 60 volume percent inorganic filler and having a void space rate or porosity...http://www.google.com/patents/US4335193?utm_source=gb-gplus-sharePatent US4335193 - Microporous film, particularly battery separator, and method of makingAdvanced Patent SearchPublication numberUS4335193 APublication typeGrantApplication numberUS 06/016,176Publication dateJun 15, 1982Filing dateF
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