DIFF Subgroup
H01P 1/215 using ferromagnetic material
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Auxiliary devices > Frequency-selective devices, e.g. filters > using ferromagnetic material
CPC:
Auxiliary devices (coupling devices of the waveguide type H01P5/00) > Frequency-selective devices, e.g. filters > using ferromagnetic material
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- H01P 1/217 the ferromagnetic material acting as a tuning element in resonators since 1980 IPC+CPC Available in IPC and CPC
- H01P 1/218 the ferromagnetic material acting as a frequency selective coupling element, e.g. YIG-filters since 1980 IPC+CPC Available in IPC and CPC