Title:
Drilling
United States Patent 2923531
US Patent References:
/0720137.html
- - 0720137

/0962019.html
- - 0962019

Device for raising sunken ships
- - 1331014

Salvaging method and apparatus
- - 1469574

Submarine hammer-drill unit
- - 1598439


Inventors:
Bauer, Robert F.
Hal, Stratton
Publication Date:
02/02/1960
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Assignee:
SHELL OIL CO
CONTINENTAL OIL CO
SUPERIOR OIL CO
UNION OIL CO
Primary Class:
175/7
Other Classes:
166/350, 166/341, 166/352
International Classes:
E21B7/128; E21B33/035; E21B33/064; E21B33/127; E21B7/12; E21B33/03; E21B33/12
US Patent References:
1766628Subaquatic drill
2187871Underwater drilling
2217879Method and apparatus for drilling into water covered ground
2399656Float
2606003Off-shore drilling
2777669Marine well drilling apparatus
2808230Off-shore drilling