Frequency-selective devices, e.g. filters

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Auxiliary devices > Frequency-selective devices, e.g. filters

CPC:

Auxiliary devices (coupling devices of the waveguide type H01P5/00) > Frequency-selective devices, e.g. filters

Of 9 combined children, 6 exist in both systems.

3 codes are CPC-only extensions.

4 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

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H01P 1/2002 CPC only CPC only
H01P 1/2005 CPC only CPC only
H01P 1/2007 CPC only CPC only
H01P 1/201 Filters for transverse electromagnetic waves (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) since 1980 +2 CPC IPC+CPC Available in IPC and CPC
H01P 1/207 Hollow waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) since 1980 IPC+CPC Available in IPC and CPC
H01P 1/212 suppressing or attenuating harmonic frequencies (H01P1/215 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
H01P 1/213 combining or separating two or more different frequencies (H01P1/215 takes precedence) since 1980 +5 CPC IPC+CPC Available in IPC and CPC
H01P 1/215 using ferromagnetic material since 1980 IPC+CPC Available in IPC and CPC
H01P 1/219 Evanescent mode filters since 1980 IPC+CPC Available in IPC and CPC