IPC Main Group
E21B 4/00 Drives for drilling, used in the borehole
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
Related Keywords
PERCUSSION drilling in deep-drilling
6 direct subcodes
Child Classifications
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- E21B 4/02 Fluid rotary type drives
- E21B 4/04 Electric drives
- E21B 4/06 Down-hole impacting means, e.g. hammers
- E21B 4/16 Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
- E21B 4/18 Anchoring or feeding in the borehole
- E21B 4/2 combined with surface drive
Top Applicants
Top 10 applicants by patent filingsfor class E21, 2013–2023, worldwide · Source: EPO PATSTAT
- HALLIBURTON ENERGY SERVICES GROUP US 26,607
- PETROCHINA COMPANY 14,382
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,137
- CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 6,517
- BAKER HUGHES US 6,269
- SCHLUMBERGER TECHNOLOGY US 5,929
- SAUDI ARABIAN OIL COMPANY SA 5,880
- SOUTHWEST PETROLEUM UNIVERSITY 4,477
- CHINA UNIVERSITY OF MINING AND TECHNOLOGY 4,357
- SCHLUMBERGER TECHNOLOGY NL 4,219