TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

Description

Covers the transmission, routing, and processing of digital information over communication networks and systems. Encompasses telegraphic communication, data transmission protocols, network architectures, error detection and correction, signal modulation and coding, and digital signal processing for communication purposes. Includes technologies for packet switching, circuit switching, and modern data communication standards, but excludes specific applications in broadcast television (H04H), telephony systems (H04M), and radio communication (H04B).

30 direct subcodes

Child Classifications

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H04L 1/00 Arrangements for detecting or preventing errors in the information received
H04L 12/00 Data switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F13/00)
H04L 13/00 Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
H04L 15/00 Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; telegraph tapping keys H01H21/86)
H04L 17/00 Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
H04L 19/00 Apparatus or local circuits for step-by-step systems
H04L 21/00 Apparatus or local circuits for mosaic printer telegraph systems
H04L 2101/00 Indexing scheme associated with group H04L61/00
H04L 2201/00 Algorithms used for the adjustment of time-domain equalizers
H04L 2203/00 Characteristics of phase shift key signals
H04L 2209/00 Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
H04L 2212/00 Encapsulation of packets
H04L 23/00 Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
H04L 2463/00 Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
H04L 25/00 Baseband systems
H04L 27/00 Modulated-carrier systems
H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
H04L 43/00 Arrangements for monitoring or testing data switching networks
H04L 45/00 Routing or path finding of packets in data switching networks (routing or path finding in wireless networks H04W40/00)
H04L 47/00 Traffic control in data switching networks (arrangements for detecting or preventing errors in the information received H04L1/00)

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