Refractivity; Phase-affecting properties, e.g. optical path length (G01N21/21 takes precedence)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Refractivity; Phase-affecting properties, e.g. optical path length

CPC: Refractivity; Phase-affecting properties, e.g. optical path length (G01N21/21 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 > Refractivity; Phase-affecting properties, e.g. optical path length

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) > Refractivity; Phase-affecting properties, e.g. optical path length (G01N21/21 takes precedence)

CPC subdivides this area 5x more granularly than IPC with 7 additional codes.

7 codes are CPC-only extensions.

Note: 5 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1980.

Child Classifications

Navigate with arrow keys, Enter to open

G01N 2021/4106 2nd only +1 CPC CPC only CPC only
G01N 2021/4126 2nd only CPC only CPC only
G01N 2021/416 2nd only CPC only CPC only
G01N 2021/4166 2nd only CPC only CPC only
G01N 2021/4173 2nd only +3 CPC CPC only CPC only
G01N 21/412 CPC only CPC only
G01N 21/4133 +3 CPC CPC only CPC only
G01N 21/43 by measuring critical angle since 1980 +4 CPC IPC+CPC Available in IPC and CPC
G01N 21/45 using interferometric methods; using Schlieren methods since 1980 +5 CPC IPC+CPC Available in IPC and CPC