CPC Main Group
H04L 9/00 arrangements for secret or secure communications; Network security protocols
Filing statistics
CPC H04L 9/00 belongs to the parent subclass H04L, which recorded 1,567,994 patent applications worldwide between 2013 and 2023. Annual filings grew from 97,627 in 2013 to 139,810 in 2023 (+43%), peaking at 168,964 applications in 2020. The most active applicants in class H04 are HUAWEI TECHNOLOGIES COMPANY (101,476 applications), QUALCOMM (101,139 applications) and SAMSUNG ELECTRONICS COMPANY (96,655 applications).
Source: EPO PATSTAT, worldwide filings
16 direct subcodes
Child Classifications
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- H04L 9/06 the encryption apparatus using shift registers or memories for block-wise coding, e.g. DES systems
- H04L 9/08 Key distribution
- H04L 9/10 with particular housing, physical features or manual controls
- H04L 9/12 Transmitting and receiving encryption devices synchronised or initially set up in a particular manner
- H04L 9/14 using a plurality of keys or algorithms
- H04L 9/30 Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
- H04L 9/32 including means for verifying the identity or authority of a user of the system
- H04L 9/34 Bits, or blocks of bits, of the telegraphic message being interchanged in time
- H04L 9/36 with means for detecting characters not meant for transmission
- H04L 9/38 Encryption being effected by mechanical apparatus, e.g. rotating cams, switches, keytape punchers
- H04L 9/40 Network security protocols
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