IPC Subgroup
H04J 3/02 Details
Introduced: September 1968
Last revised: January 2006
Full Title
Time-division multiplex systems > Details
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- MULTIPLEX COMMUNICATION
6 direct subcodes
Child Classifications
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- H04J 3/04 Distributors combined with modulators or demodulators
- H04J 3/06 Synchronising arrangements
- H04J 3/08 Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J 3/1 Arrangements for reducing cross-talk between channels
- H04J 3/12 Arrangements providing for calling or supervisory signals
- H04J 3/14 Monitoring arrangements
Top Applicants
Top 10 applicants by patent filingsfor 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