IPC Main Group
G01F 23/00 Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
Introduced: September 1968
Last revised: January 2022
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
Additional Content
In wells Adaptation to, or mounting on, steam boilers
Related Keywords
ALARM(S) for liquid levelDIP sticksGAUGE(S) glasses for indicating liquid levelmeasuring water levelindicating or measuring LEVEL(S) of liquidmeasuring height of TIDES
7 direct subcodes
Child Classifications
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- G01F 23/02 by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
- G01F 23/04 by dip members, e.g. dip-sticks
- G01F 23/14 by measurement of pressure
- G01F 23/2 by measurement of weight, e.g. to determine the level of stored liquefied gas
- G01F 23/22 by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F 23/3 by floats
- G01F 23/8 Arrangements for signal processing
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