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CPC Subgroup
E21C 27/20

Mineral freed by means not involving slitting

Full Title

Machines which completely free the mineral from the seam > Mineral freed by means not involving slitting

Filing statistics

CPC E21C 27/20 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

7 direct subcodes

Child Classifications

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  • E21C 27/22 by rotary drills with breaking-down means, e.g. wedge-shaped drills
  • E21C 27/24 by milling means acting on the full working face
  • E21C 27/26 by closely adjacent cutter chains acting on the full working face
  • E21C 27/28 by percussive drills with breaking-down means, e.g. wedge-shaped tools
  • E21C 27/30 by jaws, buckets or scoops that scoop-out the mineral
  • E21C 27/46 by percussed planing means

Top Applicants

Top 10 applicants by patent filingsfor class E21, 2013–2023, worldwide · Source: EPO PATSTAT

  1. HALLIBURTON ENERGY SERVICES GROUP US 27,652
  2. SAUDI ARABIAN OIL COMPANY SA 7,755
  3. PETROCHINA COMPANY 7,025
  4. BAKER HUGHES US 6,589
  5. SCHLUMBERGER TECHNOLOGY US 6,151
  6. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 4,443
  7. SCHLUMBERGER TECHNOLOGY NL 4,255
  8. CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 3,991
  9. SERVICES PETROLIERS SCHLUMBERGER FR 3,300
  10. SCHLUMBERGER CANADA CA 3,086