Circuits

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission > Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving > Circuits

CPC:

Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission > Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving > Circuits

IPC and CPC are identically structured here. All 5 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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H04B 1/401 for selecting or indicating operating mode since 2015 IPC+CPC Available in IPC and CPC
H04B 1/403 using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency since 2015 +1 CPC IPC+CPC Available in IPC and CPC
H04B 1/44 Transmit/receive switching IPC+CPC Available in IPC and CPC
H04B 1/50 using different frequencies for the two directions of communication IPC+CPC Available in IPC and CPC
H04B 1/54 using the same frequency for two directions of communication (H04B1/44 takes precedence) IPC+CPC Available in IPC and CPC