using surface acoustic waves

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators > Time-delay networks > using surface acoustic waves

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) > Time-delay networks > using surface acoustic waves

CPC subdivides this area 3x more granularly than IPC with 2 additional codes.

2 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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H03H 9/423 CPC only CPC only
H03H 9/426 CPC only CPC only
H03H 9/44 Frequency dependent delay lines, e.g. dispersive delay lines since 1980 IPC+CPC Available in IPC and CPC