IPC Subgroup
H04J 1/02 Details
Introduced: September 1968
Last revised: January 2006
Full Title
Frequency-division multiplex systems > Details
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- MULTIPLEX COMMUNICATION
7 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H04J 1/04 Frequency-transposition arrangements
- H04J 1/06 Arrangements for supplying the carrier waves
- H04J 1/08 Arrangements for combining channels
- H04J 1/1 Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J 1/12 Arrangements for reducing cross-talk between channels
- H04J 1/14 Arrangements providing for calling or supervisory signals
- H04J 1/16 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