H04M 3/00 Automatic or semi-automatic exchanges
Introduced: September 1968
Last revised: January 2024
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
Filing statistics
IPC H04M 3/00 belongs to the parent subclass H04M, which recorded 292,116 patent applications worldwide between 2013 and 2023. Annual filings declined from 26,112 in 2013 to 15,773 in 2023 (-40%), peaking at 34,745 applications in 2017. The most active applicants in class H04 are QUALCOMM (97,396 applications), HUAWEI TECHNOLOGIES COMPANY (96,502 applications) and SAMSUNG ELECTRONICS COMPANY (86,981 applications).
Source: EPO PATSTAT, worldwide filings
Additional Content
Selecting arrangements , Constructional details and the switching fabric of a telephone exchange
10 direct subcodes
Child Classifications
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- H04M 3/02 Calling substations, e.g. by ringing
- 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 3/2 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
- H04M 3/4 Applications of speech amplifiers
- H04M 3/42 Systems providing special services or facilities to subscribers
- H04M 3/6 Semi-automatic systems, i.e. systems 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
- 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