CPC Main Group
E21C 37/00 Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C27/14)
Filing statistics
CPC E21C 37/00 belongs to the parent subclass E21C, which recorded 16,559 patent applications worldwide between 2013 and 2023. Annual filings grew from 828 in 2013 to 1,605 in 2023 (+94%), peaking at 1,908 applications in 2021. The most active applicants in class E21 are HALLIBURTON ENERGY SERVICES GROUP (27,652 applications), SAUDI ARABIAN OIL COMPANY (7,755 applications) and PETROCHINA COMPANY (7,025 applications).
Source: EPO PATSTAT, worldwide filings
9 direct subcodes
Child Classifications
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- E21C 37/02 by wedges
- E21C 37/04 by devices with parts pressed mechanically against the wall of a borehole
- E21C 37/06 by making use of hydraulic or pneumatic pressure in a borehole
- E21C 37/16 by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B7/14)
- E21C 37/18 by electricity
- E21C 37/20 by ultrasonic waves
- E21C 37/22 Hand tools or hand-held power-operated tools specially adapted for dislodging minerals (slitting machines guided solely by hand E21C25/64)
- E21C 37/26 Chisels or other cutting tools not mentioned before
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