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PCE
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DIFF Subgroup
G01N 21/21

Polarisation-affecting properties (G01N21/19 takes precedence)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Polarisation-affecting properties

CPC: Polarisation-affecting properties (G01N21/19 takes 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 > Polarisation-affecting properties

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) > Polarisation-affecting properties (G01N21/19 takes precedence)

CPC subdivides this area 5x more granularly than IPC with 4 additional codes.

4 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1980.

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