IPC Subgroup
G01L 21/3 by making use of ionisation effects
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum gauges > by making use of ionisation effects
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
Related Keywords
using IONISATION in measuring pressure
3 direct subcodes
Child Classifications
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- G01L 21/32 using electric discharge tubes with thermionic cathodes
- G01L 21/34 using electric discharge tubes with cold cathodes
- G01L 21/36 using radioactive substances
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