IPC Subgroup
E21B 37/02 Scrapers specially adapted therefor
Introduced: September 1968
Last revised: January 2006
Full Title
Methods or apparatus for cleaning boreholes or wells > Scrapers specially adapted therefor
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
Related Keywords
SCRAPERS for boreholes
1 direct subcode
Child Classifications
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- E21B 37/04 operated by fluid pressure, e.g. free-piston scrapers