Indicating product of flow and temperature difference directly

Introduced: September 1968

Last revised: January 2006

Full Title

Measuring quantity of heat > Measuring quantity of heat conveyed by flowing media, e.g. in heating systems > based upon measurement of temperature difference > between an inlet and an outlet point, combined with measurement of rate of flow of the medium > Indicating product of flow and temperature difference directly

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 17/12 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

Additional Content

Product Mathematical Operation

3 direct subcodes

Child Classifications

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G01K 17/14 using mechanical means for both measurements
G01K 17/16 using electrical means for both measurements
G01K 17/18 using electrical means for one measurement and mechanical means for the other

Top Applicants

Top 10 applicants by patent filingsfor class G01, 2013–2023, worldwide · Source: EPO PATSTAT

SGCC(STATE GRID CORPORATION OF CHINA) 41,447
CHINESE ACADEMY OF SCIENCES 32,952
ROBERT BOSCH DE 16,470
SAMSUNG ELECTRONICS COMPANY KR 10,052
SINOPEC (CHINA PETROCHEMICAL CORPORATION) 9,573
ZHEJIANG UNIVERSITY 9,529
GUANGDONG POWER GRID CORPORATION 8,615
TSINGHUA UNIVERSITY 7,805
HALLIBURTON ENERGY SERVICES GROUP US 7,796
QUALCOMM US 7,171