Multi-membrane filter
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United States of America Patent
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Sep 17, 2002
Grant Date -
N/A
app pub date -
Apr 23, 1996
filing date -
Apr 23, 1996
priority date (Note) -
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Abstract
A filter element having a plurality of membrane layers. The filter element has a filter member having a porous sidewall. The sidewall has an outer surface and an inner surface which allow a gas to flow through. A first membrane is in communication with the outer surface for preventing particulate matter from penetrating the outer surface. A second membrane is in communication with the inner surface for preventing particulate matter from penetrating the inner surface.
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