CPC Subgroup
E21B 10/08 Roller bits (E21B10/26 takes precedence; roller core bits E21B10/06; characterised by wear resisting parts E21B10/50)
Full Title
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > Roller bits (E21B10/26 takes precedence; roller core bits E21B10/06; characterised by wear resisting parts E21B10/50)
9 direct subcodes
Child Classifications
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- E21B 10/10 with roller axle supported at both ends
- E21B 10/12 with discs 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 10/20 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 27,652
- SAUDI ARABIAN OIL COMPANY SA 7,755
- PETROCHINA COMPANY 7,025
- BAKER HUGHES US 6,589
- SCHLUMBERGER TECHNOLOGY US 6,151
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 4,443
- SCHLUMBERGER TECHNOLOGY NL 4,255
- CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 3,991
- SERVICES PETROLIERS SCHLUMBERGER FR 3,300
- SCHLUMBERGER CANADA CA 3,086