by observing changes in resistance or impedance across apertures when traversed by individual particles, e.g. by using the Coulter principle

Introduced: January 1985

Full Title

Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials > Investigating individual particles > by measuring electrical or magnetic effects > by observing changes in resistance or impedance across apertures when traversed by individual particles, e.g. by using the Coulter principle

CPC subdivides this area 7x 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 2024.

Child Classifications

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G01N 15/13 Details pertaining to apertures since 2024 IPC+CPC Available in IPC and CPC
G01N 15/131 +2 CPC CPC only CPC only
G01N 15/134 CPC only CPC only
G01N 2015/135 2nd only +1 CPC CPC only CPC only
G01N 2015/137 2nd only CPC only CPC only
G01N 2015/138 2nd only CPC only CPC only
G01N 2015/139 2nd only CPC only CPC only