Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 15, 2009
1Patent Application Number
122904111
Date Filed
October 30, 2008
1Patent Primary Examiner
Patent abstract
The preassembled drainage element is made with a water permeable membrane sleeve that has slits placed in the peripheral portion of the sleeve that is to form the bottom of the drainage element. The aggregate is post-expandable after fabrication of the drainage element so as to widen the slits and cause the periphery of the drainage element to bulge in the sections containing the slits.
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