CPC Subgroup
H04B 1/40 Circuits
Full Title
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
5 direct subcodes
Child Classifications
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- H04B 1/401 for selecting or indicating operating mode
- H04B 1/403 using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B 1/44 Transmit/receive switching
- H04B 1/50 using different frequencies for the two directions of communication
- H04B 1/54 using the same frequency for two directions of communication (H04B1/44 takes precedence)
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- HUAWEI TECHNOLOGIES COMPANY CN 101,476
- QUALCOMM US 101,139
- SAMSUNG ELECTRONICS COMPANY KR 96,655
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
- LG ELECTRONICS KR 55,253
- HUAWEI TECHNOLOGIES COMPANY 54,181
- SONY CORPORATION JP 35,309
- ZTE CORPORATION CN 32,950
- INTEL CORPORATION US 27,533
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498