Filters (multiple-port electromechanical filters H03H9/70)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Filters

CPC: Filters (multiple-port electromechanical filters H03H9/70)

Full Title

Full titles differ between systems:

IPC:

Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators > Filters

CPC:

Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (electro-acoustic transducers such as loudspeakers, microphones or gramophone pick-ups H04R; piezoelectric, electrostrictive or magnetostrictive devices with mechanical input or output, e.g. actuators or sensors, H10N30/00, H10N35/00) > Filters (multiple-port electromechanical filters H03H9/70)

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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H03H 9/462 +2 CPC CPC only CPC only
H03H 9/48 Coupling means therefor since 1980 +1 CPC IPC+CPC Available in IPC and CPC
H03H 9/54 comprising resonators of piezoelectric or electrostrictive material (comprising resonators using surface acoustic waves H03H9/64) since 1980 +3 CPC IPC+CPC Available in IPC and CPC
H03H 9/62 comprising resonators of magnetostrictive material (H03H9/64 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
H03H 9/64 using surface acoustic waves since 1980 +4 CPC IPC+CPC Available in IPC and CPC