H04L
Digital communication
Official title: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
H04L (Digital communication) appears on 613,388 US grants and 699,142 published applications in this corpus.
Search patents in H04L- Granted patents
- 613,388
- Published applications
- 699,142
- Assignees
- 56,122
- Inventors
- 575,939
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 278 | 0 |
| 1977 | 288 | 0 |
| 1978 | 252 | 0 |
| 1979 | 174 | 0 |
| 1980 | 259 | 0 |
| 1981 | 281 | 0 |
| 1982 | 302 | 0 |
| 1983 | 294 | 0 |
| 1984 | 339 | 0 |
| 1985 | 459 | 0 |
| 1986 | 505 | 0 |
| 1987 | 605 | 0 |
| 1988 | 537 | 0 |
| 1989 | 738 | 0 |
| 1990 | 629 | 0 |
| 1991 | 744 | 0 |
| 1992 | 865 | 0 |
| 1993 | 1018 | 0 |
| 1994 | 1326 | 0 |
| 1995 | 1598 | 0 |
| 1996 | 2066 | 0 |
| 1997 | 1996 | 0 |
| 1998 | 3318 | 0 |
| 1999 | 3680 | 0 |
| 2000 | 4111 | 0 |
| 2001 | 4491 | 2401 |
| 2002 | 4898 | 11172 |
| 2003 | 5320 | 13260 |
| 2004 | 6562 | 14257 |
| 2005 | 6610 | 16451 |
| 2006 | 10117 | 17768 |
| 2007 | 9303 | 19125 |
| 2008 | 10795 | 21392 |
| 2009 | 12536 | 20966 |
| 2010 | 16971 | 21140 |
| 2011 | 17781 | 20211 |
| 2012 | 20652 | 22786 |
| 2013 | 23469 | 26277 |
| 2014 | 28687 | 32177 |
| 2015 | 29567 | 36164 |
| 2016 | 31657 | 37969 |
| 2017 | 33985 | 38038 |
| 2018 | 33306 | 36907 |
| 2019 | 39551 | 39367 |
| 2020 | 40978 | 42314 |
| 2021 | 38155 | 39547 |
| 2022 | 37028 | 39249 |
| 2023 | 36008 | 38063 |
| 2024 | 35240 | 36293 |
| 2025 | 32192 | 31829 |
| 2026 | 20867 | 24019 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- H04L 67/00Network arrangements or protocols for supporting network services or applications158,217
- H04L 63/00Network architectures or network communication protocols for network security129,383
- H04L 12/00Data switching networks81,731
- H04L 5/00Arrangements affording multiple use of the transmission path72,440
- H04L 9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications68,040
- H04L 41/00Arrangements for maintenance, administration or management of data switching networks65,112
- H04L 1/00Arrangements for detecting or preventing errors in the information received64,694
- H04L 69/00Network arrangements, protocols or services independent of the application payload and not47,509
All 30 main groupsShow fewer
- H04L 43/00Arrangements for monitoring or testing data switching networks46,363
- H04L 65/00Network arrangements, protocols or services for supporting real-time applications in data packet45,963
- H04L 27/00Modulated-carrier systems43,792
- H04L 47/00Traffic control in data switching networks41,196
- H04L 45/00Routing or path finding of packets in data switching networks39,967
- H04L 51/00User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols36,040
- H04L 25/00Baseband systems35,119
- H04L 2209/00Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements forIndexing code26,976
- H04L 61/00Network arrangements, protocols or services for addressing or naming26,273
- H04L 49/00Packet switching elements21,323
- H04L 7/00Arrangements for synchronising receiver with transmitter14,803
- H04L 2101/00Indexing scheme associated with group h04l61/00Indexing code9,839
- H04L 2463/00Additional details relating to network architectures or network communication protocols for networkIndexing code9,645
- H04L 2212/00Encapsulation of packetsIndexing code1,261
- H04L 23/00Apparatus or local circuits for systems other than those covered by groups384
- H04L 13/00Details of the apparatus or circuits covered by groups h04l15/00 or h04l17/0082
- H04L 15/00Apparatus or local circuits for transmitting or receiving dot-and-dash codes43
- H04L 17/00Apparatus or local circuits for transmitting or receiving codes wherein each character38
- H04L 2201/00Algorithms used for the adjustment of time-domain equalizersIndexing code30
- H04L 2203/00Characteristics of phase shift key signalsIndexing code23
- H04L 21/00Apparatus or local circuits for mosaic printer telegraph systems21
- H04L 19/00Apparatus or local circuits for step-by-step systems0
Recent patents
- Method and system for implementing a medical service system6 Oct 2026US 12,751,620 B2OnMed LLC
- Standardized management of distributed energy resources6 Oct 2026US 12,752,662 B2PowerFlex Systems, LLC
- Cloud-based keyless entry system6 Oct 2026US 12,752,736 B2Red Hat, Inc.
- Fluid measuring reservoir for breast pumps6 Oct 2026US 12,754,055 B2Willow Innovations, Inc.
- Data correction and phase optimization in high-speed receivers6 Oct 2026US 12,754,237 B2Diodes Incorporated
- Aggregation and reporting of surgical hub data8 Oct 2026US 2026/0306129 A1
- Real-time driving data insight system and method with edge computing and artificial intelligence tools8 Oct 2026US 2026/0307657 A1State Farm Mutual Automobile Insurance Company
- Method for automatically configuring control units of a control system and control system8 Oct 2026US 2026/0307659 A1
- System for detecting circuit anomalies in trailer wiring8 Oct 2026US 2026/0309762 A1Grote Industries, Inc.
- Joint communication and sensing8 Oct 2026US 2026/0309836 A1Telefonaktiebolaget LM Ericsson (publ)
Most cited
By later US patents
- Systems and methods for secure transaction management and electronic rights protection3,563US 5,892,900 AIntertrust Technologies Corporation · 1999
- Computer method for updating a network design2,523US 5,821,937 ANetSuite Development, L.P. · 1998
- System for allowing all remote computers to perform annotation on an image and replicating the annotated image on the respective displays of other comuters2,385US 5,608,872 ANCR Corporation · 1997
- Determining the visibility to a remote database client2,367US 6,233,617 B1Siebel Systems, Inc. · 2001
- System for generation of user profiles for a system for customized electronic identification of desirable objects2,365US 5,754,939 A1998