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DIFF Subgroup
E21F 17/08

Distributing hydraulic power; Pipe networks for hydraulic liquid (pipe-line systems in general F17D)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Distributing hydraulic power; Pipe networks for hydraulic liquid

CPC: Distributing hydraulic power; Pipe networks for hydraulic liquid (pipe-line systems in general F17D)

Full Title

Full titles differ between systems:

IPC:

Methods or devices for use in mines or tunnels, not covered elsewhere > Distributing means for power supply > Distributing hydraulic power; Pipe networks for hydraulic liquid

CPC:

Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B) > Distributing means for power supply in mines > Distributing hydraulic power; Pipe networks for hydraulic liquid (pipe-line systems in general F17D)

No child classifications to compare. This is a leaf node in both 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