IPC Subgroup
E21B 37/06 using chemical means for preventing or limiting the deposition of paraffins or like substances
Introduced: January 1980
Last revised: January 2006
Full Title
Methods or apparatus for cleaning boreholes or wells > using chemical means for preventing or limiting the deposition of paraffins or like substances
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