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PCE
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DIFF Subgroup
G01L 7/18

using liquid as the pressure-sensitive medium, e.g. liquid-column gauges

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements > using liquid as the pressure-sensitive medium, e.g. liquid-column gauges

CPC:

Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements ( transmitting or indicating the displacement of mechanical pressure-sensitive elements by electric or magnetic means G01L9/00; measuring differences of two or more pressure values G01L13/00; measuring two or more pressure values simultaneously G01L15/00) > using liquid as the pressure-sensitive medium, e.g. liquid-column gauges

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

Child Classifications

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  • G01L 7/182 CPC only CPC only
  • G01L 7/185 CPC only CPC only
  • G01L 7/187 CPC only CPC only
  • G01L 7/20 involving a closed chamber above the liquid level, the chamber being exhausted or housing low-pressure gas; Liquid barometers IPC+CPC Available in IPC and CPC
  • G01L 7/22 involving floats, e.g. floating bells IPC+CPC Available in IPC and CPC
  • G01L 7/24 involving balances in the form of rings partly filled with liquid 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