DIFF Subgroup
H04L 51/21 Monitoring or handling of messages
Introduced: January 2022
Full Title
User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail > Monitoring or handling of messages
IPC and CPC are identically structured here. All 8 subcodes exist in both systems.
IPC defines codes here since 2022.
Child Classifications
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- H04L 51/216 Handling conversation history, e.g. grouping of messages in sessions or threads since 2022 IPC+CPC Available in IPC and CPC
- H04L 51/222 using geographical location information, e.g. messages transmitted or received in proximity of a certain spot or area since 2022 IPC+CPC Available in IPC and CPC
- H04L 51/224 providing notification on incoming messages, e.g. pushed notifications of received messages since 2022 IPC+CPC Available in IPC and CPC
- H04L 51/23 Reliability checks, e.g. acknowledgments or fault reporting since 2022 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
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