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发明名称
Diverter apparatus
摘要
A diverter apparatus for use in conjunction with earth drilling operations to divert cuttings from the area surrounding the bore hole, and including a pneumatically extensible and retractable ground-engaging skirt which surrounds the bore hole.
申请公布号
US4889196(A)
申请公布日期
1989.12.26
申请号
US19880268486
申请日期
1988.11.07
申请人
JOHNSTON, VAUGHN R.
发明人
JOHNSTON, VAUGHN R.
分类号
B23Q1/34;E21B21/015;E21B21/16
主分类号
B23Q1/34
代理机构
代理人
主权项
地址
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