IPC Subgroup
E21B 3/02 Surface drives for rotary drilling
Introduced: September 1968
Last revised: January 2006
Full Title
Rotary drilling > Surface drives for rotary drilling
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
4 direct subcodes
Child Classifications
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- E21B 3/025 with a to-and-fro rotation of the tool
- E21B 3/03 with an intermittent unidirectional rotation of the tool
- E21B 3/035 with slipping or elastic transmission
- E21B 3/04 Rotary tables