| 发明名称 |
DRILL BIT HAVING CANTED SEAL |
| 摘要 |
A drill bit having a canted or non-canted leg backface, a canted or non-cant ed seal in the interface between the cone backface and the shirttail, and a canted seal tha t can be semi--encapsulated so that there is no straight-line path across the seal.</ SDOAB>
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| 申请公布号 |
CA2297864(C) |
申请公布日期 |
2008.09.09 |
| 申请号 |
CA20002297864 |
申请日期 |
2000.02.02 |
| 申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
CAWTHORNE, CHRIS E.;NGUYEN, QUAN V.;PETERSON, STEVEN W.;SIRACKI, MICHAEL A. |
| 分类号 |
E21B10/08;E21B10/22;E21B10/25 |
主分类号 |
E21B10/08 |
| 代理机构 |
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代理人 |
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