IPC Subgroup
E21B 10/08 Roller bits
Introduced: January 1980
Last revised: January 2006
Full Title
Drill bits > Roller bits
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
7 direct subcodes
Child Classifications
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- E21B 10/1 with roller axle supported at both ends
- E21B 10/12 with disc cutters
- E21B 10/14 combined with non-rolling cutters other than of leading-portion type
- E21B 10/16 characterised by tooth form or arrangement
- E21B 10/18 characterised by conduits or nozzles for drilling fluids
- E21B 10/2 characterised by detachable or adjustable parts, e.g. legs or axles
- E21B 10/22 characterised by bearing, lubrication or sealing details
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