IPC Subgroup
E21B 25/1 Formed core retaining or severing means
Introduced: January 1980
Last revised: January 2006
Full Title
Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors > Formed core retaining or severing means
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
2 direct subcodes
Child Classifications
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- E21B 25/12 of the sliding wedge type
- E21B 25/14 mounted on pivot transverse to core axis