发明名称 |
BI-STEEL PERCUSSIVE DRILL ROD |
摘要 |
A drill rod includes a first end section, a mid-section, wherein the first end section and the mid-section are connected and wherein the first end section is manufactured using different steel than is used for the mid-section. Such a configuration can reduce the costs associated with forming a drill rod while maintaining the functionality of such a drill rod. |
申请公布号 |
WO2009132079(A3) |
申请公布日期 |
2010.01.07 |
申请号 |
WO2009US41374 |
申请日期 |
2009.04.22 |
申请人 |
LONGYEAR TM, INC.;YAO, JING, JAMES |
发明人 |
YAO, JING, JAMES |
分类号 |
B25D17/02;B25D17/00;C22C38/00;E21B10/36 |
主分类号 |
B25D17/02 |
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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