Title:
Cushion drill collar
United States Patent 3323327
Inventors:
Leathers, Clarence H.
Nixon, Jeddy D.
Publication Date:
06/06/1967
Export Citation:
Click for automatic bibliography generation
Assignee:
GRANT OIL TOOL COMPANY
Primary Class:
464/20
Other Classes:
175/320
International Classes:
E21B17/07; E21B17/16; E21B17/00; E21B17/02
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US Patent References:
2991635Resilient drilling tool
2987129Fluid pressure one way jar
2795398Shock absorbing drill collar
2756022Shock absorber coupling for rotary drill stem