H04J MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
Description
H04J covers multiplex communication systems and techniques that enable simultaneous transmission of multiple signals or information streams over a single communication channel or medium. This includes time-division multiplexing (TDM), frequency-division multiplexing (FDM), code-division multiplexing (CDM), and wavelength-division multiplexing (WDM), along with associated synchronization, signaling, and channel allocation methods. The classification encompasses technologies for telecommunications networks, data transmission systems, and integrated communication infrastructures where efficient bandwidth utilization through signal combining is essential. Related switching, routing, and network management aspects specific to multiplex systems are also included, distinguishing this from broader electrical communication techniques covered in H04.
Filing statistics
CPC subclass H04J recorded 67,722 patent applications worldwide between 2013 and 2023. Annual filings declined from 7,059 in 2013 to 4,065 in 2023 (-42%), peaking at 7,268 applications in 2018. The most active applicants in class H04 are HUAWEI TECHNOLOGIES COMPANY (101,476 applications), QUALCOMM (101,139 applications) and SAMSUNG ELECTRONICS COMPANY (96,655 applications).
Source: EPO PATSTAT, worldwide filings
11 direct subcodes
Child Classifications
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- H04J 1/00 Frequency-division multiplex systems (H04J14/00 takes precedence)
- H04J 11/00 Orthogonal multiplex systems, (H04J13/00 takes precedence)
- H04J 13/00 Code division multiplex systems (for frequency hopping H04B1/713)
- H04J 14/00 Optical multiplex systems
- H04J 2203/00 Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J 2211/00 Orthogonal indexing scheme relating to orthogonal multiplex systems
- H04J 3/00 Time-division multiplex systems (H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q)
- H04J 4/00 Combined time-division and frequency-division multiplex systems (H04J13/00 takes precedence )
- H04J 7/00 Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
- H04J 9/00 Multiplex systems in which each channel is represented by a different type of modulation of the carrier
- H04J 99/00 Subject matter not provided for in other groups of this subclass
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