with core substantially closed in itself, e.g. toroid

Introduced: September 1968

Full Title

Fixed inductances of the signal type > with magnetic core > with core substantially closed in itself, e.g. toroid

CPC subdivides this area 4x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

Note: 2 CPC extensions are marked as secondary classification only.

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H01F 17/062 CPC only CPC only
H01F 17/08 Loading coils for telecommunication circuits IPC+CPC Available in IPC and CPC
H01F 2017/065 2nd only CPC only CPC only
H01F 2017/067 2nd only CPC only CPC only