by making use of hydraulic or pneumatic pressure in a borehole

Full Title

Other methods or devices for dislodging with or without loading > by making use of hydraulic or pneumatic pressure in a borehole

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

MINING OR QUARRYING

Related Keywords

Child Classifications

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• E21C 37/08 Devices with pistons, plungers, or the like pressed locally against the wall of the borehole
• E21C 37/1 Devices with expanding elastic casings
• E21C 37/12 by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
• E21C 37/14 by compressed air; by gas blast; by gasifying liquids