| 发明名称 |
DRILL BIT HAVING GEOMETRICALLY SHARP INSERTS |
| 摘要 |
A drill bit configured for boring holes or wells into the earth, the drill bit having a face and a plurality of zones, the drill bit having geometrically sharp inserts located in an inner zone and non-geometrically sharp inserts located in an outer zone.
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| 申请公布号 |
US2013140093(A1) |
申请公布日期 |
2013.06.06 |
| 申请号 |
US201113309389 |
申请日期 |
2011.12.01 |
| 申请人 |
ZHOU YONG;YIN WEIQI;HEAD BRADLEY J.;SMITH INTERNATIONAL, INC. |
发明人 |
ZHOU YONG;YIN WEIQI;HEAD BRADLEY J. |
| 分类号 |
E21B10/00 |
主分类号 |
E21B10/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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