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DIFF Subgroup
G01F 1/86

Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure

Introduced: July 1974

Title

Titles differ between systems:

IPC: Indirect mass flowmeters, e.g. measuring volume flow and density, temperature, or pressure

CPC: Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure

Full Title

Full titles differ between systems:

IPC:

Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow > Devices for measuring mass flow of a fluid or a fluent solid material > Indirect mass flowmeters, e.g. measuring volume flow and density, temperature, or pressure

CPC:

Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow (measuring a proportion of the volume flow G01F5/00) > Devices for measuring mass flow of a fluid or a fluent solid material > Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

IPC defines codes here since 1974.

Child Classifications

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  • G01F 1/88 with differential-pressure measurement to determine the volume flow since 1974 IPC+CPC Available in IPC and CPC
  • G01F 1/90 with positive-displacement meter or turbine meter to determine the volume flow since 1974 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