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DIFF Subgroup
E21B 4/06

Down-hole impacting means, e.g. hammers (boring rams E21B11/02)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Down-hole impacting means, e.g. hammers

CPC: Down-hole impacting means, e.g. hammers (boring rams E21B11/02)

Full Title

Full titles differ between systems:

IPC:

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers

CPC:

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers (boring rams E21B11/02)

Additional Content IPC

Boring rams

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

IPC defines codes here since 1980.

Child Classifications

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  • E21B 4/08 impact being obtained by gravity only, e.g. with lost-motion connection since 1980 IPC+CPC Available in IPC and CPC
  • E21B 4/10 continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts since 1980 IPC+CPC Available in IPC and CPC
  • E21B 4/12 Electrically operated hammers since 1980 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