Off-shore drilling and production apparatus
United States Patent 3195639

Inventors:
Pollard, Robert O.
Wakefield Jr., Charles E.
Publication Date:
07/20/1965
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Assignee:
RICHFIELD OIL CORP
Primary Class:
166/340
Other Classes:
175/7, 166/363
International Classes:
E21B7/128; E21B19/09; E21B7/12; E21B19/00
US Patent References:
3114420Apparatus and method for sub-sea drilling
Foreign References:
GB855369A