IPC Subgroup
H04L 12/5 Circuit switching systems, i.e. systems in which the path is physically permanent during the communication
Introduced: January 1990
Last revised: January 2006
Full Title
Data switching networks > Circuit switching systems, i.e. systems in which the path is physically permanent during the communication
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
Related Keywords
CIRCUITS switching systems for data switching networks
1 direct subcode
Child Classifications
Navigate with arrow keys, Enter to open
- H04L 12/52 using time division techniques
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