Fluid pressure operated actuated operator tool for well tools
United States Patent 3378080

Inventors:
Fredd, John V.
Publication Date:
04/16/1968
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Assignee:
OTIS ENG CO
Primary Class:
166/156
Other Classes:
166/381, 294/86.150
International Classes:
E21B23/08; E21B23/00
US Patent References:
3279543Well tool for removing sand
3302721Dual zone completion system with special valve