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PCE
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DIFF Subgroup
E21C 35/18

Mining picks; Holders therefor (planing knives E21C27/44)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Mining picks; Holders therefor

CPC: Mining picks; Holders therefor (planing knives E21C27/44)

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 > Mining picks; Holders therefor

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 > Mining picks; Holders therefor (planing knives E21C27/44)

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1995.

Child Classifications

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  • E21C 35/184 CPC only CPC only
  • E21C 35/186 CPC only CPC only
  • E21C 35/187 with arrangement of fluid-spraying nozzles (supply of fluid to the nozzles E21C35/22) since 1995 IPC+CPC Available in IPC and CPC
  • E21C 35/188 CPC only CPC only

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