DIFF Main Group
H04J 1/00 Frequency-division multiplex systems (H04J14/00 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Frequency-division multiplex systems
CPC: Frequency-division multiplex systems (H04J14/00 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Frequency-division multiplex systems
CPC:
Frequency-division multiplex systems (H04J14/00 takes precedence)
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H04J 1/18 in which all the carriers are amplitude-modulated (H04J1/02 takes precedence ) IPC+CPC Available in IPC and CPC
- H04J 1/20 in which at least one carrier is angle-modulated (H04J1/02 takes precedence; FM without multiplex H04B1/00, H04B14/006, H04B15/00; PSK H04L5/12; impulse-modulation without multiplex H04B14/02; time-division multiplexing for data transmission H04L5/22; telemetry G08C15/06 - G08C15/12; telephony H04Q11/00, H04Q11/04, H04Q11/0407) 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