IPC Main Group
H04B 3/00 Line transmission systems
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION
Additional Content
Alarm systems using power transmission lines
Related Keywords
LINE(S) transmission system
5 direct subcodes
Child Classifications
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- H04B 3/02 Details
- H04B 3/5 Systems for transmission between fixed stations two-conductor transmission lines
- H04B 3/52 Systems for transmission between fixed stations waveguides
- H04B 3/54 Systems for transmission power distribution lines
- H04B 3/6 Systems for communication between relatively movable stations, e.g. for communication with lift
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