Scattering, i.e. diffuse reflection (G01N21/25, G01N21/41 take precedence )

Introduced: January 1980

Title

Titles differ between systems:

IPC: Scattering, i.e. diffuse reflection

CPC: Scattering, i.e. diffuse reflection (G01N21/25, G01N21/41 take precedence )

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 > Scattering, i.e. diffuse reflection

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) > Scattering, i.e. diffuse reflection (G01N21/25, G01N21/41 take precedence )

CPC subdivides this area 11x more granularly than IPC with 10 additional codes.

10 codes are CPC-only extensions.

Note: 6 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1980.

Child Classifications

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G01N 2021/4702 2nd only CPC only CPC only
G01N 2021/4704 2nd only +5 CPC CPC only CPC only
G01N 2021/473 2nd only CPC only CPC only
G01N 2021/4733 2nd only CPC only CPC only
G01N 2021/4735 2nd only CPC only CPC only
G01N 2021/4792 2nd only CPC only CPC only
G01N 21/4738 +3 CPC CPC only CPC only
G01N 21/4785 CPC only CPC only
G01N 21/4788 +1 CPC CPC only CPC only
G01N 21/4795 +1 CPC CPC only CPC only
G01N 21/49 within a body or fluid since 1980 +1 CPC IPC+CPC Available in IPC and CPC