IPC Main Group
H04L 27/00 Modulated-carrier systems
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
Filing statistics
IPC H04L 27/00 belongs to the parent subclass H04L, which recorded 1,397,397 patent applications worldwide between 2013 and 2023. Annual filings grew from 91,584 in 2013 to 136,803 in 2023 (+49%), peaking at 147,432 applications in 2022. The most active applicants in class H04 are QUALCOMM (97,396 applications), HUAWEI TECHNOLOGIES COMPANY (96,502 applications) and SAMSUNG ELECTRONICS COMPANY (86,981 applications).
Source: EPO PATSTAT, worldwide filings
6 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H04L 27/01 Equalisers
- H04L 27/02 Amplitude-modulated carrier systems, e.g. using on/off keying; Single sideband or vestigial sideband modulation
- H04L 27/1 Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L 27/26 Systems using multi-frequency codes
- H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups , , , or
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