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发明名称
Oilwell swab cup
摘要
An oilwell swab cup is formed by clamping a plurality of vertical wire members in a circular U-shaped cup and molding an elastomeric material around the wires and cup.
申请公布号
US4099451(A)
申请公布日期
1978.07.11
申请号
US19760756304
申请日期
1976.12.27
申请人
DRESSER INDUSTRIES, INC.
发明人
BLACKWELL, HENRY WAYNE
分类号
E21B37/10;(IPC1-7):F16J1/04;F16J15/32
主分类号
E21B37/10
代理机构
代理人
主权项
地址
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