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PCE
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DIFF Subgroup
G01N 29/42

by frequency filtering

Introduced: January 2006

Full Title

Full titles differ between systems:

IPC:

Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object > Detecting the response signal > by frequency filtering

CPC:

Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object (G01N3/00 - G01N27/00 take precedence) > Detecting the response signal > by frequency filtering

No child classifications to compare. This is a leaf node in both IPC and CPC.