IPC Subgroup
E21B 25/02 the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
Introduced: January 1980
Last revised: January 2006
Full Title
Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors > the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
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
1 direct subcode
Child Classifications
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- E21B 25/04 the core receiver having a core forming cutting edge or element, e.g. punch type core barrels