characterised by the flaw, defect or object feature examined

Introduced: January 2000

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 specially adapted for particular applications > Investigating the presence of flaws, defects or contamination > in moving material, e.g. paper, textiles > characterised by the flaw, defect or object feature examined

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 specially adapted for particular applications > Investigating the presence of flaws or contamination > in moving material, e.g. running paper or textiles (G01N21/90, G01N21/91, G01N21/94 take precedence) > characterised by the flaw, defect or object feature examined

CPC subdivides this area 3x more granularly than IPC with 6 additional codes.

6 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

IPC defines codes here since 2000.

Child Classifications

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G01N 2021/8924 2nd only CPC only CPC only
G01N 2021/8925 2nd only CPC only CPC only
G01N 2021/8927 2nd only CPC only CPC only
G01N 2021/8928 2nd only CPC only CPC only
G01N 21/8921 CPC only CPC only
G01N 21/8922 CPC only CPC only
G01N 21/894 Pinholes since 2000 IPC+CPC Available in IPC and CPC
G01N 21/896 Optical defects in or on transparent materials, e.g. distortion, surface flaws since 2000 +3 CPC IPC+CPC Available in IPC and CPC
G01N 21/898 Irregularities in textured or patterned surfaces, e.g. textiles, wood since 2000 +2 CPC IPC+CPC Available in IPC and CPC