发明申请
- 专利标题： DRAG BIT WITH UTILITY BLADES
- 专利标题（中）： 拖拉刀头与实用刀片
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申请号： US12201516申请日： 2008-08-29
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公开(公告)号： US20090065263A1公开(公告)日： 2009-03-12
- 发明人: Yuelin Shen , Youhe Zhang
- 申请人： Yuelin Shen , Youhe Zhang
- 申请人地址： US TX Houston
- 专利权人： SMITH INTERNATIONAL, INC.
- 当前专利权人： SMITH INTERNATIONAL, INC.
- 当前专利权人地址： US TX Houston
- 主分类号： E21B10/42
- IPC分类号： E21B10/42
摘要：
A drill bit comprises a bit body and a plurality of cutting blades extending radially from the bit body, the plurality of cutting blades further comprising cutting elements disposed thereon. The drill bit also comprises a plurality of utility blades extending radially from the bit body, the plurality of utility blades being free of cutting elements.
公开/授权文献
- US07926596B2 Drag bit with utility blades 公开/授权日：2011-04-19
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