CPC Subgroup
G01N 21/88 Investigating the presence of flaws or contamination
Full Title
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
9 direct subcodes
Child Classifications
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- G01N 21/89 in moving material, e.g. running paper or textiles (G01N21/90, G01N21/91, G01N21/94 take precedence)
- G01N 21/90 in a container or its contents (G01N21/91 takes precedence)
- G01N 21/91 using penetration of dyes, e.g. fluorescent ink
- G01N 21/93 Detection standards; Calibrating
- G01N 21/94 Investigating contamination, e.g. dust (G01N21/85 takes precedence)
- G01N 21/95 characterised by the material or shape of the object to be examined (G01N21/89 - G01N21/91, G01N21/94 take precedence)