DIFF Subgroup
H04B 1/16 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 > Receivers > 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 > Receivers > Circuits
Of 9 combined children, 5 exist in both systems.
4 codes are CPC-only extensions.
3 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) IPC+CPC Available in IPC and CPC
- H04B 1/20 for coupling gramophone pick-up, recorder output, or microphone to receiver +3 CPC IPC+CPC Available in IPC and CPC
- H04B 1/26 for superheterodyne receivers (multiple frequency-changing H03D7/16) IPC+CPC Available in IPC and CPC
- H04B 1/30 for homodyne or synchrodyne receivers (demodulator circuits H03D1/22) +3 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class H04,2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 97,396
- HUAWEI TECHNOLOGIES COMPANY CN 96,502
- SAMSUNG ELECTRONICS COMPANY KR 86,981
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
- HUAWEI TECHNOLOGIES COMPANY 55,349
- LG ELECTRONICS KR 53,649
- CANON 33,341
- SONY CORPORATION JP 32,761
- ZTE CORPORATION CN 32,274
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327
Top Applicants (CPC)
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