Descriptions for E21B and notes/indexes are displayed on this screen.
| E21B
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EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS[5]
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Note(s)
This subclass covers:[7,8]primarily equipment for drilling of earth or rock in their natural formation;similar equipment for drilling of man-made structures in situ, e g of road surfaces or concrete structures This subclass does not cover:hand-held drilling machines, e g for domestic use;drilling equipment for manufacturing operations, i e where an article is worked, e g for further processing; which are covered by relevant subclasses of section B, e g B23B;compositions for drilling of boreholes or wells or for treating boreholes or wells, which compositions are covered by group C09K 8/00, e g compositions for enhanced recovery methods for obtaining hydrocarbons C09K 8/58
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Subclass indexes
METHODS OR APPARATUS FOR DRILLING | 1/00-7/00 | DRILLING TOOLS; ACCESSORIES THEREFOR | 10/00, 11/00; 12/00 | OTHER EQUIPMENT OR DETAILS FOR DRILLING; WELL EQUIPMENT OR MAINTENANCE | Derricks; drilling rods or the like | 15/00; 17/00, 19/00 | Flushing or cleaning; sealing; heating or cooling | 21/00, 37/00; 33/00; 36/00 | Valve arrangements; fire-fighting | 34/00; 35/00 | Other equipment or details | 23/00-31/00, 40/00, 41/00 | OBTAINING FLUIDS FROM WELLS | 43/00 | CONTROL; SURVEYING OR TESTING | 44/00; 45/00-49/00 |
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