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DIFF Subgroup
E21D 17/02

Cantilever extension or similar protecting devices

Introduced: September 1968

Full Title

Caps for supporting mine roofs > Cantilever extension or similar protecting devices

Of 7 combined children, 4 exist in both systems.

2 codes are CPC-only extensions, 1 exist only in IPC.

Child Classifications

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  • E21D 17/0206 CPC only CPC only
  • E21D 17/0213 CPC only CPC only
  • E21D 17/022 Auxiliary devices for temporary support of roof-supporting beams whilst assembling IPC only IPC only
  • E21D 17/03 Brackets for roof-supporting bars IPC+CPC Available in IPC and CPC
  • E21D 17/04 for use in longwall working IPC+CPC Available in IPC and CPC
  • E21D 17/06 for use in drifting galleries 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