G01K MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
Introduced: September 1968
Description
G01K covers temperature measurement and heat quantity determination across diverse industrial and scientific applications. This subclass encompasses thermometers, pyrometers, calorimeters, and thermally-sensitive transducers that detect or quantify thermal phenomena. Included are resistance thermometers, thermocouples, radiation thermometers, and thermal sensors designed for process monitoring, temperature control, and heat transfer analysis. The subclass specifically addresses thermally-sensitive elements that do not fall under more specialized classifications, serving as a broad catch-all for temperature and heat measurement technologies not classified elsewhere in the IPC system.
Title
Titles differ between systems:
IPC: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
CPC: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
Full Title
Full titles differ between systems:
MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
Additional Content IPC
Glossary
thermometer thermometers includes thermally-sensitive elements not provided for in other subclasses.
Limiting references
Radiation pyrometry
Application references
Measuring temperature of human body parts for diagnostic purposes Heat-sensitive devices for control of fire-fighting equipment Heat-sensitive sheets for use in thermography Measuring temperature specially adapted to boreholes or wells Arrangements of temperature sensing elements for regulating or controlling in gas turbines Use of thermally-sensitive elements in systems controlling or regulating combustion Flow measurement by thermal means Investigating or analysing materials by use of thermal means, e.g. by calorimetry , Meteorology; Indication of human comfort ; Temperature control Fire alarms Thermally-sensitive members for thermally-actuated switches Temperature sensing in car batteries Control or measuring devices, e.g. for temperature of metal, in the art of manufacture of metal sheets, wires, rods, tubes or profiles Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass, in the art of casting of metals Measuring, controlling or regulating of temperature in injection moulding Indicating devices concerning coolant temperature, in the art of cooling of machines, engines, or internal-combustion engines Structural combination of nuclear reactor elements with sensitive instruments for measuring temperature
Of 19 combined children, 10 exist in both systems.
9 codes are CPC-only extensions.
Note: 9 CPC extensions are marked as secondary classification only.
7 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G01K 1/00 Details of thermometers not specially adapted for particular types of thermometer (circuits for reducing thermal inertia G01K7/42) IPC+CPC Available in IPC and CPC
- G01K 11/00 Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 +2 CPC IPC+CPC Available in IPC and CPC
- G01K 13/00 Thermometers specially adapted for specific purposes +1 CPC IPC+CPC Available in IPC and CPC
- G01K 17/00 Measuring quantity of heat (measuring temperature by calorimetry G01K3/00 - G01K11/00; specially adapted for measuring thermal properties of materials, e.g. specific heat, heat of combustion G01N) +2 CPC IPC+CPC Available in IPC and CPC
- G01K 2201/00 Application of thermometers in air-conditioning systems 2nd only +1 CPC CPC only CPC only
- G01K 2205/00 Application of thermometers in motors, e.g. of a vehicle 2nd only +2 CPC CPC only CPC only
- G01K 2217/00 Temperature measurement using electric or magnetic components already present in the system to be measured 2nd only CPC only CPC only
- G01K 3/00 Thermometers giving results other than momentary value of temperature (G01K7/42 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
- G01K 5/00 Measuring temperature based on the expansion or contraction of a material (G01K9/00 takes precedence; giving other than momentary value of temperature G01K3/00) IPC+CPC Available in IPC and CPC
- G01K 7/00 Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat (giving results other than momentary value of temperature G01K3/00) +2 CPC IPC+CPC Available in IPC and CPC
- G01K 9/00 Measuring temperature based on movements caused by redistribution of weight, e.g. tilting thermometer (not giving momentary value of temperature G01K3/00) IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class G01,2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 21,460
- ROBERT BOSCH DE 17,801
- SGCC(STATE GRID CORPORATION OF CHINA) 17,347
- SAMSUNG ELECTRONICS COMPANY KR 13,192
- QUALCOMM US 9,900
- HALLIBURTON ENERGY SERVICES GROUP US 9,742
- PHILIPS ELECTRONICS NL 7,249
- MITSUBISHI ELECTRIC CORPORATION JP 6,503
- ZHEJIANG UNIVERSITY 6,414
- DENSO CORPORATION JP 6,382