Machines which completely free the mineral from the seam

Filing statistics

CPC E21C 27/00 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

5 direct subcodes

Child Classifications

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E21C 27/01 specially adapted for removing overhanging coal
E21C 27/02 solely by slitting (rods, drums, for same E21C25/10; saws, discs, wheels E21C25/18; chains, chain guides, for same E21C25/28)
E21C 27/10 by both slitting and breaking-down
E21C 27/18 by both slitting and planing
E21C 27/20 Mineral freed by means not involving slitting

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