Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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23/00
Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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E21B23/04
operated by fluid means, e.g. actuated by explosion
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E21B23/0412
characterised by pressure chambers, e.g. vacuum chambers
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