Drainage unit with external covering and method for manufacture
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United States of America Patent
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Sep 4, 2012
Grant Date -
Jul 19, 2007
app pub date -
Nov 21, 2006
filing date -
Jan 13, 2006
priority date (Note) -
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Abstract
Drainage units comprise lightweight aggregate held within a perforated sleeve having an exterior surface, where at least a portion of the exterior surface comprises a barrier material which is substantially impervious to solids.
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