Reinforced, three zone microporous membrane
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United States of America Patent
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Jul 24, 2001
Grant Date -
N/A
app pub date -
Mar 18, 1998
filing date -
Apr 11, 1997
priority date (Note) -
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Abstract
A three zone, reinforced, continuous, geometrically symmetrical microporous membrane including a porous support material encapsulated within a middle zone disposed between an upper zone and a lower zone wherein at least one of the three zones has a pore size at least about twenty (20%) percent greater than the pore size of the other two zones is disclosed. Apparatus and methods for fabricating three zone reinforced, continuous, geometrically symmetrical, microporous membrane are also disclosed.
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