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IPC Subgroup
G01K 7/2

in a specially-adapted circuit, e.g. bridge circuit

Introduced: September 1968

Last revised: January 2006

Full Title

Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat > using resistive elements > the element being a linear resistance, e.g. platinum resistance thermometer > in a specially-adapted circuit, e.g. bridge circuit

Classification Context

Section:
PHYSICS
Class:
MEASURING; TESTING
Subclass:
MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

Filing statistics

IPC G01K 7/2 belongs to the parent subclass G01K, which recorded 118,108 patent applications worldwide between 2013 and 2023. Annual filings grew from 5,775 in 2013 to 14,309 in 2023 (+148%), peaking at 17,527 applications in 2020. The most active applicants in class G01 are SGCC(STATE GRID CORPORATION OF CHINA) (41,447 applications), CHINESE ACADEMY OF SCIENCES (32,952 applications) and ROBERT BOSCH (16,470 applications).

Source: EPO PATSTAT, worldwide filings

1 direct subcode

Child Classifications

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  • G01K 7/21 for modifying the output characteristic, e.g. linearising

Top Applicants

Top 10 applicants by patent filingsfor 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