CPC Main Group
H04L 27/00 Modulated-carrier systems
13 direct subcodes
Child Classifications
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- H04L 27/01 Equalisers
- H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation (H04L27/32 takes precedence)
- H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence)
- H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence)
- H04L 27/26 Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
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