IPC Subgroup
H04B 10/075 using an in-service signal
Introduced: January 2013
Full Title
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication > Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems > using an in-service signal
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION
Additional Content
Using a reflected signal, e.g. using optical time-domain reflectometers [OTDRs]
2 direct subcodes
Child Classifications
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- H04B 10/077 using a supervisory or additional signal
- H04B 10/079 using measurements of the data signal
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