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经营范围
发明名称
Protective Overlay Coating for PDC Drill Bits
摘要
申请公布号
EP1318268(B1)
申请公布日期
2006.01.04
申请号
EP20020102485
申请日期
2002.10.25
申请人
SMITH INTERNATIONAL, INC.
发明人
OLDHAM, THOMAS W.;KEMBAIYAN, KUMAR T.
分类号
E21B10/54;B23K31/02;E21B10/55
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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