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PCE
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DIFF Subgroup
E21C 47/02

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

Introduced: September 1968

Title

Titles differ between systems:

IPC: for coal, brown coal, or the like

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

Full Title

Full titles differ between systems:

IPC:

Machines for obtaining, or the removal of, materials in open-pit mines > for coal, brown coal, or the like

CPC:

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)

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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

Top Applicants

Top Applicants (IPC)

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

  1. HALLIBURTON ENERGY SERVICES GROUP US 26,607
  2. PETROCHINA COMPANY 14,382
  3. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,137
  4. CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 6,517
  5. BAKER HUGHES US 6,269
  6. SCHLUMBERGER TECHNOLOGY US 5,929
  7. SAUDI ARABIAN OIL COMPANY SA 5,880
  8. SOUTHWEST PETROLEUM UNIVERSITY 4,477
  9. CHINA UNIVERSITY OF MINING AND TECHNOLOGY 4,357
  10. SCHLUMBERGER TECHNOLOGY NL 4,219

Top Applicants (CPC)

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