发明名称 |
Nonwoven horizontal drainage system |
摘要 |
A horizontal soil drainage system consisting of a nonwoven three-dimensional mat of a plurality of looped, intersecting and substantially amorphous filaments of melt-spun synthetic polymers bonded together at their intersections, at least one of the outer surfaces of said mat having a lower cross-sectional porosity than the center zone of said mat.
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申请公布号 |
US4019326(A) |
申请公布日期 |
1977.04.26 |
申请号 |
US19720311656 |
申请日期 |
1972.12.04 |
申请人 |
AKZONA INCORPORATED |
发明人 |
HERVELING, WILHELM;BIRKER, ALFRED;DAIMLER, BERTHOLD H.;VOS, JAN G.;STAPP, HANS |
分类号 |
E02B11/00;(IPC1-7):E02B11/00 |
主分类号 |
E02B11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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