Automatic repetition systems, e.g. Van Duuren systems

Full Title

Arrangements for detecting or preventing errors in the information received > by using return channel > in which the return channel carries supervisory signals, e.g. repetition request signals > Automatic repetition systems, e.g. Van Duuren systems

Filing statistics

CPC H04L 1/18 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

8 direct subcodes

Child Classifications

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H04L 1/1803 Stop-and-wait protocols
H04L 1/1806 Go-back-N protocols
H04L 1/1809 Selective-repeat protocols
H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
H04L 1/1829 Arrangements specially adapted for the receiver end
H04L 1/1867 Arrangements specially adapted for the transmitter end

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