CPC Main Group
H04M 3/00 Automatic or semi-automatic exchanges
Filing statistics
CPC H04M 3/00 belongs to the parent subclass H04M, which recorded 236,508 patent applications worldwide between 2013 and 2023. Annual filings declined from 19,559 in 2013 to 13,232 in 2023 (-32%), peaking at 28,340 applications in 2017. 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
12 direct subcodes
Child Classifications
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- H04M 3/02 Calling substations, e.g. by ringing (selective calling H04Q)
- H04M 3/08 Indicating faults in circuits or apparatus
- H04M 3/16 with lock-out or secrecy provision in party-line systems
- H04M 3/18 with means for reducing interference ; with means for reducing effects due to line faults
- H04M 3/20 with means for interrupting existing connections; with means for breaking-in on conversations
- H04M 3/22 Arrangements for supervision, monitoring or testing
- H04M 3/38 Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections (queuing arrangements H04Q3/64)
- H04M 3/40 Applications of speech amplifiers
- H04M 3/42 Systems providing special services or facilities to subscribers (specially adapted for wireless communication networks H04W4/00)
- H04M 3/60 Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
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