Percussion drilling

Introduced: September 1968

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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E21B 1/02 Surface drives for drop hammers , e.g. with a cable IPC+CPC Available in IPC and CPC
E21B 1/12 with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence) since 2000 IPC+CPC Available in IPC and CPC
E21B 1/36 Tool-carrier piston type, i.e. in which the tool is connected to an impulse member since 2000 IPC+CPC Available in IPC and CPC
E21B 1/38 Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member since 2000 IPC+CPC Available in IPC and CPC