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DIFF Main Group
G01N 3/00

Investigating strength properties of solid materials by application of mechanical stress

Introduced: September 1968

IPC and CPC are identically structured here. All 14 subcodes exist in both systems.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • G01N 3/20 by applying steady bending forces (G01N3/26, G01N3/28 take precedence) IPC+CPC Available in IPC and CPC
  • G01N 3/22 by applying steady torsional forces (G01N3/26, G01N3/28 take precedence) IPC+CPC Available in IPC and CPC
  • G01N 3/24 by applying steady shearing forces (G01N3/26, G01N3/28 take precedence) IPC+CPC Available in IPC and CPC
  • G01N 3/26 Investigating twisting or coiling properties IPC+CPC Available in IPC and CPC
  • G01N 3/28 Investigating ductility, e.g. suitability of sheet metal for deep-drawing or spinning IPC+CPC Available in IPC and CPC
  • G01N 3/58 Investigating machinability by cutting tools; Investigating the cutting ability of tools IPC+CPC Available in IPC and CPC
  • G01N 3/60 Investigating resistance of materials, e.g. refractory materials, to rapid heat changes IPC+CPC Available in IPC and CPC
  • G01N 3/62 Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups 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