IPC Main Group
H04J 13/00 Code division multiplex systems
Introduced: July 1974
Last revised: January 2011
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- MULTIPLEX COMMUNICATION
Additional Content
Details of the signal processing which are covered by systems that use frequency hopping as a means to divide the communication medium MC-CDMA
Related Keywords
code division MULTIPLEXING systemsmultiplex systems using spread SPECTRUM
2 direct subcodes
Child Classifications
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- H04J 13/1 Code generation
- H04J 13/16 Code allocation
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