IPC Subgroup
E21B 31/113 hydraulically operated
Introduced: January 1980
Last revised: January 2006
Full Title
Fishing for or freeing objects in boreholes or wells > using impact means for releasing stuck parts, e.g. jars > hydraulically operated
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