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DIFF Subgroup
G01R 31/302

Contactless testing

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere > Testing of electronic circuits, e.g. by signal tracer > Contactless testing

CPC:

Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere ( testing line transmission systems H04B3/46; testing or measuring semiconductors or solid state devices during manufacture ) > Testing of electronic circuits, e.g. by signal tracer ( testing for short-circuits, discontinuities, leakage or incorrect line connection G01R31/50; checking computers G06F11/00; checking static stores for correct operation G11C29/00 ) > Contactless testing

Of 7 combined children, 6 exist in both systems.

1 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1990.

Child Classifications

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  • G01R 31/3025 CPC only CPC only
  • G01R 31/303 of integrated circuits (G01R31/305 - G01R31/315 take precedence) since 1995 IPC+CPC Available in IPC and CPC
  • G01R 31/304 of printed or hybrid circuits (G01R31/305 - G01R31/315 take precedence) since 1995 IPC+CPC Available in IPC and CPC
  • G01R 31/312 by capacitive methods since 1990 IPC+CPC Available in IPC and CPC
  • G01R 31/315 by inductive methods since 1990 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