CPC Subgroup
E21B 10/567 with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
Full Title
Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) > characterised by wear resisting parts, e.g. diamond inserts > Button-type inserts (E21B10/52 takes precedence) > with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
4 direct subcodes
Child Classifications
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- E21B 10/573 characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element
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