CPC Main Group
E21C 35/00 Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
Filing statistics
CPC E21C 35/00 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
10 direct subcodes
Child Classifications
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- E21C 35/02 Locking equipment for slewable parts
- E21C 35/04 Safety devices (operating in the event of breakage of a haulage cable or chain E21C29/20)
- E21C 35/06 Equipment for positioning the whole machine in relation to its sub-structure
- E21C 35/08 Guiding the machine
- E21C 35/18 Mining picks; Holders therefor (planing knives E21C27/44)
- E21C 35/20 General features of equipment for removal of chippings, e.g. for loading on conveyor
- E21C 35/22 Equipment for preventing the formation of, or for removal of, dust (picks with arrangement of fluid-spraying nozzles E21C35/187; )
- E21C 35/24 Remote control specially adapted for machines for slitting or completely freeing the mineral (control in general G05)
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