Drainage element with a periphery of different materials
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United States of America Patent
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Apr 24, 2012
Grant Date -
May 14, 2009
app pub date -
Dec 4, 2008
filing date -
Nov 2, 2006
priority date (Note) -
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Abstract
The drainage element is made with a periphery formed of a filter material that allows the passage of water and prevents the passage of soil and a second peripheral section of net material that allows the passage of water while the preventing the passage of the lightweight aggregate therein. The filter material is preferably made of spun bonded polyester and may be made of a biodegradable material such as starch.
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