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PCE
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IPC Main Group
E21B 36/00

Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones

Introduced: January 1980

Last revised: January 2006

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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