G01N 21/00 Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light (G01N3/00 - G01N19/00 take precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
CPC: Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light (G01N3/00 - G01N19/00 take precedence)
Full Title
Full titles differ between systems:
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light (G01N3/00 - G01N19/00 take precedence)
Additional Content IPC
Limiting references
Investigating strength properties of solid materials by application of mechanical stress Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid Analysing materials by measuring the pressure or volume of a gas or vapour Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials Investigating resistance of materials to the weather, to corrosion, or to light Investigating materials by mechanical methods
Application references
Investigation of spectral properties of light per se, or measurements of the properties of materials where spectral properties of light are sensed and primary emphasis is placed on creating, detecting or analysing the spectrum, providing that the properties of the materials to be investigated are of minor importance Contactless testing of electronic circuits using optical radiation
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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- G01N 21/01 Arrangements or apparatus for facilitating the optical investigation since 1980 +5 CPC IPC+CPC Available in IPC and CPC
- G01N 21/17 Systems in which incident light is modified in accordance with the properties of the material investigated (where the material investigated is optically excited causing a change in wavelength of the incident light G01N21/63) since 1980 +13 CPC IPC+CPC Available in IPC and CPC
- G01N 21/62 Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- G01N 21/75 Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated (systems in which material is burnt in a flame or plasma G01N21/72, G01N21/73) since 1980 +6 CPC IPC+CPC Available in IPC and CPC
- G01N 21/84 Systems specially adapted for particular applications since 1980 +10 CPC 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