Image enhancement or correction, e.g. subtraction or averaging techniques

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Arrangements or instruments for measuring magnetic variables > involving magnetic resonance > using nuclear magnetic resonance [NMR] > NMR imaging systems > Signal processing systems, e.g. using pulse sequences > Image enhancement or correction, e.g. subtraction or averaging techniques

CPC:

Arrangements or instruments for measuring magnetic variables > involving magnetic resonance (medical aspects A61B5/055; magnetic resonance gyrometers G01C19/60) > using nuclear magnetic resonance [NMR] (G01R33/24, G01R33/62 take precedence) > NMR imaging systems > Signal processing systems, e.g. using pulse sequences > Image enhancement or correction, e.g. subtraction or averaging techniques

CPC subdivides this area 3x more granularly than IPC with 6 additional codes.

6 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1995.

Child Classifications

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G01R 33/5601 CPC only CPC only
G01R 33/5602 CPC only CPC only
G01R 33/5604 CPC only CPC only
G01R 33/5605 CPC only CPC only
G01R 33/5607 CPC only CPC only
G01R 33/5608 CPC only CPC only
G01R 33/561 by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences since 1995 +4 CPC IPC+CPC Available in IPC and CPC
G01R 33/563 of moving material, e.g. flow contrast angiography since 1995 +6 CPC IPC+CPC Available in IPC and CPC
G01R 33/565 Correction of image distortions, e.g. due to magnetic field inhomogeneities since 1995 +9 CPC IPC+CPC Available in IPC and CPC
G01R 33/567 gated by physiological signals since 1995 +2 CPC IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

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

Top Applicants (CPC)

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

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