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PCE
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DIFF Subgroup
E21B 3/02

Surface drives for rotary drilling

Introduced: September 1968

Full Title

Rotary drilling > Surface drives for rotary drilling

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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  • E21B 3/022 CPC only CPC only
  • E21B 3/025 with a to-and-fro rotation of the tool since 2000 IPC+CPC Available in IPC and CPC
  • E21B 3/03 with an intermittent unidirectional rotation of the tool since 2000 IPC+CPC Available in IPC and CPC
  • E21B 3/035 with slipping or elastic transmission since 2000 IPC+CPC Available in IPC and CPC