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发明名称
BUTTRESS THREAD FORM
摘要
申请公布号
US5092635(A)
申请公布日期
1992.03.03
申请号
US19900516138
申请日期
1990.04.27
申请人
BAKER HUGHES INCORPORATED
发明人
DELANGE, RICHARD W.;EVANS, MERLE E.;ANDERSON, DONNA S.
分类号
E21B17/042;F16L15/00;F16L15/06
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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