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DIFF Subgroup
E21C 35/22

Equipment for preventing the formation of, or for removal of, dust (picks with arrangement of fluid-spraying nozzles E21C35/187; )

Introduced: September 1968

Title

Titles differ between systems:

IPC: Equipment for preventing the formation of, or for removal of, dust

CPC: Equipment for preventing the formation of, or for removal of, dust (picks with arrangement of fluid-spraying nozzles E21C35/187; )

Full Title

Full titles differ between systems:

IPC:

Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups , or > Equipment for preventing the formation of, or for removal of, dust

CPC:

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 > Equipment for preventing the formation of, or for removal of, dust (picks with arrangement of fluid-spraying nozzles E21C35/187; )

CPC subdivides this area 3x more granularly than IPC with 2 additional codes.

2 codes are CPC-only extensions.

IPC defines codes here since 1995.

Child Classifications

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  • E21C 35/223 CPC only CPC only
  • E21C 35/226 CPC only CPC only
  • E21C 35/23 Distribution of spraying-fluids in rotating cutter-heads since 1995 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