发明名称 |
Underdrainage pipe |
摘要 |
An underdrainage pipe comprises a liquid-collecting pipe, protrusions on the liquid-collecting pipe, a filter layer around the liquid-collecting pipe and a liquid-conducting way, and the protrusions having at least one recess for each and the bottom portion of the recess not reaching the surface of the liquid-collecting pipe.
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申请公布号 |
US4182580(A) |
申请公布日期 |
1980.01.08 |
申请号 |
US19780887746 |
申请日期 |
1978.03.17 |
申请人 |
MITSUI PETROCHEMICAL INDUSTRIES LTD |
发明人 |
HIEDA, SHOZO;INABA, MINORU;UEHARA, YOSHIO |
分类号 |
F16L9/06;E02B11/00;F16L11/12;(IPC1-7):E02B13/00;F16L11/11 |
主分类号 |
F16L9/06 |
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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