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CPC Subgroup
E21F 17/10

Distributing pneumatic power; Pipe networks for compressed air (pipe-line systems in general F17D)

Full Title

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

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