发明名称 |
Degasification of coal seams |
摘要 |
Mineable coal seams which are in proximity to an overlying or underlying coal seam are degasified in advance of and during mining by drilling a generally horizontal borehole in the overlying or underlying coal seam and producing gas therefrom.
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申请公布号 |
US4303274(A) |
申请公布日期 |
1981.12.01 |
申请号 |
US19800156300 |
申请日期 |
1980.06.04 |
申请人 |
CONOCO INC. |
发明人 |
THAKUR, PRAMOD C. |
分类号 |
E21F7/00;(IPC1-7):E21C37/00 |
主分类号 |
E21F7/00 |
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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