CPC Subgroup
H04L 25/40 Transmitting circuits; Receiving circuits
Full Title
Baseband systems > Synchronous or start-stop systems, e.g. for Baudot code > Transmitting circuits; Receiving circuits
5 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H04L 25/42 using mechanical distributors
- H04L 25/44 using relay distributors
- H04L 25/45 using electronic distributors
- H04L 25/46 using tuning forks or vibrating reeds
- H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels
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