DIFF Subgroup
E21C 37/06 by making use of hydraulic or pneumatic pressure in a borehole
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Other methods or devices for dislodging with or without loading > by making use of hydraulic or pneumatic pressure in a borehole
CPC:
Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C27/14) > by making use of hydraulic or pneumatic pressure in a borehole
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- E21C 37/08 Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole IPC+CPC Available in IPC and CPC
- 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 (slitting by jets of water E21C25/60; blasting by explosives F42D) IPC+CPC Available in IPC and CPC