CPC Main Group
G01L 21/00 Vacuum gauges
Filing statistics
CPC G01L 21/00 belongs to the parent subclass G01L, which recorded 97,855 patent applications worldwide between 2013 and 2023. Annual filings grew from 5,225 in 2013 to 8,981 in 2023 (+72%), peaking at 11,079 applications in 2020. The most active applicants in class G01 are CHINESE ACADEMY OF SCIENCES (21,460 applications), ROBERT BOSCH (17,801 applications) and SGCC(STATE GRID CORPORATION OF CHINA) (17,347 applications).
Source: EPO PATSTAT, worldwide filings
6 direct subcodes
Child Classifications
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- G01L 21/02 having a compression chamber in which gas, whose pressure is to be measured, is compressed
- G01L 21/08 by measuring variations in the transmission of acoustic waves through the medium, the pressure of which is to be measured
- G01L 21/10 by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured
- G01L 21/16 by measuring variation of frictional resistance of gases
- G01L 21/26 by making use of radiometer action, i.e. of the pressure caused by the momentum of molecules passing from a hotter to a cooler member; Vacuum gauges of the Knudsen type
- G01L 21/30 by making use of ionisation effects
Top Applicants
Top 10 applicants by patent filingsfor 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