DIFF Main Group
G01N 9/00 Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
Introduced: September 1968
Additional Content IPC
density mass per unit volume specific gravity density of a substance divided by the density of water (since the latter is 1 gr/cm3, specific gravity is the same number as density but without any units)
Of 9 combined children, 8 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G01N 9/08 by measuring buoyant force of solid materials by weighing both in air and in a liquid IPC+CPC Available in IPC and CPC
- G01N 9/10 by observing bodies wholly or partially immersed in fluid materials IPC+CPC Available in IPC and CPC
- G01N 9/24 by observing the transmission of wave or particle radiation through the material IPC+CPC Available in IPC and CPC
- G01N 9/32 by using flow properties of fluids, e.g. flow through tubes or apertures IPC+CPC Available in IPC and CPC
- G01N 9/36 Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture (methods of measurement in general G01N9/02 - G01N9/32) 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