IPC Subgroup
E21B 36/04 using electrical heaters
Introduced: January 1980
Last revised: January 2006
Full Title
Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones > using electrical heaters
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