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DIFF Subgroup
H01F 27/08

Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Cooling; Ventilating

CPC: Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)

Full Title

Full titles differ between systems:

IPC:

Details of transformers or inductances, in general > Cooling; Ventilating

CPC:

Details of transformers or inductances, in general > Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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  • H01F 27/085 CPC only CPC only
  • H01F 27/20 Cooling by special gases or non-ambient air IPC+CPC Available in IPC and CPC
  • H01F 27/22 Cooling by heat conduction through solid or powdered fillings IPC+CPC Available in IPC and CPC