发明名称 |
Drill bit with radially expandable cutter, and method of using same |
摘要 |
A drill bit having a body with a stationary cutter and a rotatable cutter such that in a first position the rotatable cutter does not radially extend beyond a periphery of the stationary cutter and in a second position the rotatable cutter radially extends beyond the periphery of the stationary cutter.
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申请公布号 |
US7686103(B2) |
申请公布日期 |
2010.03.30 |
申请号 |
US20070758913 |
申请日期 |
2007.06.06 |
申请人 |
SAN JUAN COAL COMPANY |
发明人 |
PILE JAMES D. |
分类号 |
E21B7/28;E21B10/32;E21B10/34 |
主分类号 |
E21B7/28 |
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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