发明名称 |
Filter layer - esp for land drainage pipes using acrylic filter material |
摘要 |
The inner layer of filter material around the slotted land drainpipes is protected by an outersheath of organic textile material which rots away after a given length of burial in the ground. The filter layer proper is of an acrylic material and remains stable after rotting of the sheath. |
申请公布号 |
DE2115534(A1) |
申请公布日期 |
1972.10.12 |
申请号 |
DE19712115534 |
申请日期 |
1971.03.31 |
申请人 |
Ripken geb. Oltmanns, Charlotte |
发明人 |
Ripken, Friedrich |
分类号 |
B01D29/00;B01D39/08;E02B11/00 |
主分类号 |
B01D29/00 |
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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