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DIFF Main Group
E21B 28/00

Vibration generating arrangements for boreholes or wells, e.g. for stimulating production ( for transmitting measuring-signals E21B47/14; for geophysical measurements G01V1/02)

Introduced: January 1995

Title

Titles differ between systems:

IPC: Vibration generating arrangements for boreholes or wells, e.g. for stimulating production

CPC: Vibration generating arrangements for boreholes or wells, e.g. for stimulating production ( for transmitting measuring-signals E21B47/14; for geophysical measurements G01V1/02)

Full Title

Full titles differ between systems:

IPC:

Vibration generating arrangements for boreholes or wells, e.g. for stimulating production

CPC:

Vibration generating arrangements for boreholes or wells, e.g. for stimulating production ( for transmitting measuring-signals E21B47/14; for geophysical measurements G01V1/02)

Additional Content IPC

Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling, using acoustic waves Generating seismic energy for geophysical measurements

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