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)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Systems in which incident light is modified in accordance with the properties of the material investigated

CPC: 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)

Full Title

Full 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 > Systems in which incident light is modified in accordance with the properties of the material investigated

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) > 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)

CPC subdivides this area 3x more granularly than IPC with 13 additional codes.

13 codes are CPC-only extensions.

Note: 10 CPC extensions are marked as secondary classification only.

4 shared codes have differing titles between IPC and CPC.

Child Classifications

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G01N 2021/1734 2nd only +1 CPC CPC only CPC only
G01N 2021/1738 2nd only +3 CPC CPC only CPC only
G01N 2021/1746 2nd only CPC only CPC only
G01N 2021/1748 2nd only +1 CPC CPC only CPC only
G01N 2021/1757 2nd only +1 CPC CPC only CPC only
G01N 2021/1761 2nd only +1 CPC CPC only CPC only
G01N 2021/1765 2nd only +2 CPC CPC only CPC only
G01N 2021/178 2nd only +2 CPC CPC only CPC only
G01N 2021/1789 2nd only +1 CPC CPC only CPC only
G01N 2021/1793 2nd only +2 CPC CPC only CPC only
G01N 21/1702 +3 CPC CPC only CPC only
G01N 21/171 +2 CPC CPC only CPC only
G01N 21/1717 +7 CPC CPC only CPC only
G01N 21/19 Dichroism since 1980 IPC+CPC Available in IPC and CPC
G01N 21/21 Polarisation-affecting properties (G01N21/19 takes precedence) since 1980 +4 CPC IPC+CPC Available in IPC and CPC
G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands since 1980 +4 CPC IPC+CPC Available in IPC and CPC
G01N 21/41 Refractivity; Phase-affecting properties, e.g. optical path length (G01N21/21 takes precedence) since 1980 +7 CPC IPC+CPC Available in IPC and CPC
G01N 21/47 Scattering, i.e. diffuse reflection (G01N21/25, G01N21/41 take precedence ) since 1980 +10 CPC IPC+CPC Available in IPC and CPC
G01N 21/55 Specular reflectivity since 1980 +6 CPC IPC+CPC Available in IPC and CPC
G01N 21/59 Transmissivity (G01N21/25 takes precedence) since 1980 +2 CPC IPC+CPC Available in IPC and CPC