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)

Child Classifications

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• H03H 2009/0019
• H03H 9/0004
• H03H 9/0023
• H03H 9/02 Details
• H03H 9/15 Constructional features of resonators consisting of piezoelectric or electrostrictive material (H03H9/25 takes precedence)
• H03H 9/22 Constructional features of resonators consisting of magnetostrictive material
• H03H 9/24 Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive
• H03H 9/25 Constructional features of resonators using surface acoustic waves
• H03H 9/30 Time-delay networks
• H03H 9/46 Filters (multiple-port electromechanical filters H03H9/70)
• H03H 9/66 Phase shifters
• H03H 9/70 Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
• H03H 9/74 Multiple-port networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (networks for phase shifting H03H9/66)