IPC Subgroup
G01N 23/22 by measuring secondary emission from the material
Introduced: September 1968
Last revised: January 2018
Full Title
Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or > by measuring secondary emission from the material
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
8 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- G01N 23/2202 Preparing specimens therefor
- G01N 23/2204 Specimen supports therefor; Sample conveying means therefor
- G01N 23/2206 Combination of two or more measurements, at least one measurement being that of secondary emission, e.g. combination of secondary electron [SE] measurement and back-scattered electron [BSE] measurement
- G01N 23/2209 using wavelength dispersive spectroscopy [WDS]
- G01N 23/221 by activation analysis
- G01N 23/223 by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
- G01N 23/225 using electron or ion microprobes
- G01N 23/227 Measuring photoelectric effect , e.g. photoelectron emission microscopy [PEEM]
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