IPC Subgroup
E21B 33/126 with fluid-pressure-operated elastic cup or skirt
Introduced: September 1968
Last revised: January 2006
Full Title
Sealing or packing boreholes or wells > in the borehole > Packers; Plugs > with fluid-pressure-operated elastic cup or skirt
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