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DIFF Subgroup
E21B 33/068

having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E21B33/05)

Introduced: January 1980

Title

Titles differ between systems:

IPC: having provision for introducing objects or fluids into, or removing objects from, wells

CPC: having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E21B33/05)

Full Title

Full titles differ between systems:

IPC:

Sealing or packing boreholes or wells > Surface sealing or packing > Well heads; Setting-up thereof > having provision for introducing objects or fluids into, or removing objects from, wells

CPC:

Sealing or packing boreholes or wells > Surface sealing or packing > Well heads; Setting-up thereof > having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E21B33/05)

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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  • E21B 33/072 for cable-operated tools (E21B33/076 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
  • E21B 33/076 specially adapted for underwater installations 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