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PCE
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DIFF Subgroup
G01R 33/38

Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Arrangements or instruments for measuring magnetic variables > involving magnetic resonance > Details of apparatus provided for in groups > Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field

CPC:

Arrangements or instruments for measuring magnetic variables > involving magnetic resonance (medical aspects A61B5/055; magnetic resonance gyrometers G01C19/60) > Details of apparatus provided for in groups G01R33/44 - G01R33/64 > Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field

Of 9 combined children, 5 exist in both systems.

4 codes are CPC-only extensions.

IPC defines codes here since 1995.

Child Classifications

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  • G01R 33/3802 CPC only CPC only
  • G01R 33/3804 CPC only CPC only
  • G01R 33/3806 CPC only CPC only
  • G01R 33/3808 CPC only CPC only
  • G01R 33/383 using permanent magnets since 1995 IPC+CPC Available in IPC and CPC
  • G01R 33/389 Field stabilisation since 1995 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class G01,2013–2023, worldwide · Source: EPO PATSTAT

  1. SGCC(STATE GRID CORPORATION OF CHINA) 41,447
  2. CHINESE ACADEMY OF SCIENCES 32,952
  3. ROBERT BOSCH DE 16,470
  4. SAMSUNG ELECTRONICS COMPANY KR 10,052
  5. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 9,573
  6. ZHEJIANG UNIVERSITY 9,529
  7. GUANGDONG POWER GRID CORPORATION 8,615
  8. TSINGHUA UNIVERSITY 7,805
  9. HALLIBURTON ENERGY SERVICES GROUP US 7,796
  10. QUALCOMM US 7,171

Top Applicants (CPC)

Class G01,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 21,460
  2. ROBERT BOSCH DE 17,801
  3. SGCC(STATE GRID CORPORATION OF CHINA) 17,347
  4. SAMSUNG ELECTRONICS COMPANY KR 13,192
  5. QUALCOMM US 9,900
  6. HALLIBURTON ENERGY SERVICES GROUP US 9,742
  7. PHILIPS ELECTRONICS NL 7,249
  8. MITSUBISHI ELECTRIC CORPORATION JP 6,503
  9. ZHEJIANG UNIVERSITY 6,414
  10. DENSO CORPORATION JP 6,382