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PCE
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CPC Subgroup
E21C 47/02

for coal, brown coal, or the like (dredgers or soil-shifting machines in general E02F)

Full Title

Machines for obtaining or the removal of materials in open-pit mines (obtaining peat E21C49/00) > for coal, brown coal, or the like (dredgers or soil-shifting machines in general E02F)

3 direct subcodes

Child Classifications

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  • E21C 47/04 Conveyor bridges used in co-operation with the winning apparatus
  • E21C 47/06 Cableway conveyors used in co-operation with the winning apparatus (underground hauling E21F13/00)
  • E21C 47/08 Devices for cutting-out partings, e.g. layers of sand between seams of coal

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