Submergible apparatus for underwater operations
United States Patent 3202218

Inventors:
Watts, John D.
John, Slack
Publication Date:
08/24/1965
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Assignee:
GRAY TOOL CO
Primary Class:
166/356
Other Classes:
175/9, 137/236.100
International Classes:
E21B7/12; E21B33/037; E21B37/06; E21B33/03; E21B37/00
US Patent References:
2854215Offshore oil well installation
2906500Completion of wells under water
3004602Underwater oil well completion
3062288Underwater dual tubing well completion
3063500Underwater christmas tree protector
3103976Pipe joint locator for underwater wells
Foreign References:
GB868184A