H04L 25/20
Repeater circuits
Official title: Repeater circuits; Relay circuits
H04L25/20 (Repeater circuits) appears on 471 US grants and 317 published applications in this corpus.
Search patents in H04L- Granted patents
- 471
- Published applications
- 317
- Assignees
- 268
- Inventors
- 870
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 11 | 0 |
| 1978 | 12 | 0 |
| 1979 | 6 | 0 |
| 1980 | 6 | 0 |
| 1981 | 12 | 0 |
| 1982 | 11 | 0 |
| 1983 | 10 | 0 |
| 1984 | 10 | 0 |
| 1985 | 5 | 0 |
| 1986 | 7 | 0 |
| 1987 | 12 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 8 | 0 |
| 1999 | 5 | 0 |
| 2000 | 3 | 0 |
| 2001 | 4 | 1 |
| 2002 | 9 | 12 |
| 2003 | 4 | 10 |
| 2004 | 10 | 15 |
| 2005 | 4 | 11 |
| 2006 | 10 | 11 |
| 2007 | 9 | 11 |
| 2008 | 6 | 16 |
| 2009 | 16 | 19 |
| 2010 | 12 | 18 |
| 2011 | 23 | 22 |
| 2012 | 14 | 13 |
| 2013 | 21 | 13 |
| 2014 | 22 | 19 |
| 2015 | 15 | 14 |
| 2016 | 18 | 32 |
| 2017 | 22 | 16 |
| 2018 | 18 | 12 |
| 2019 | 22 | 11 |
| 2020 | 15 | 4 |
| 2021 | 6 | 10 |
| 2022 | 7 | 6 |
| 2023 | 15 | 6 |
| 2024 | 4 | 5 |
| 2025 | 6 | 7 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04L 25/24Relay circuits using discharge tubes or semiconductor devices186
- H04L 25/26Circuits with optical sensing means , i.e. using opto-couplers for isolation45
- H04L 25/22Repeaters for converting two wires to four wires38
- H04L 25/202Using mechanical devices1
- H04L 25/207Using electromagnetic switches1
- H04L 25/205Using tuning forks or vibrating reeds0
Recent patents
- Relay device, relay method and storage medium25 Aug 2026US 12,719,826 B2Autonetworks Technologies, Ltd.
- Pre-emphasis buffer systems and related methods3 Mar 2026US 12,567,861 B2Semiconductor Components Industries, LLC
- Retimer with slicer level adjustment3 Feb 2026US 12,542,556 B2Texas Instruments Incorporated
- Efficient signaling scheme for high-speed ultra short reach interfaces30 Sep 2025US 12,430,268 B2Marvell Asia Pte Ltd
- Relay station, transmission method for relay station, and communication system15 Jul 2025US 12,362,784 B2Toyota Jidosha Kabushiki Kaisha
- Retimer with slicer level adjustment9 Jul 2026US 2026/0197006 A1
- Efficient signaling scheme for high-speed ultra short reach interfaces2 Jul 2026US 2026/0186999 A1Marvell Asia Pte Ltd
- Relay device, relay method and storage medium22 Jan 2026US 2026/0025355 A1Autonetworks Technologies, Ltd.
- Multimode Heterogeneous Cellular Communication with Integrated Multi-Channel Link Diversity, Physical Layer Optimization, and Radio Access Handover4 Dec 2025US 2025/0373888 A1China Entropy Co., Ltd.
- Relay station, transmission method for relay station, and communication system16 Oct 2025US 2025/0323688 A1Toyota Jidosha Kabushiki Kaisha
Most cited
By later US patents
- Universal lan power line carrier repeater system and method163US 5,818,821 AIntelogis, Inc. · 1998
- Repeating for low-overhead communication in a network162US 9,326,316 B2QUALCOMM Incorporated · 2016
- Electro-optical isolator circuit for line powered modem136US 4,417,099 AUniversal Data Systems, Inc. · 1983
- Method for providing service and rate negotiation in a mobile communication system117US 5,638,412 AQUALCOMM Incorporated · 1997
- Expandable integrated circuit multiport repeater controller with multiple media independent interfaces and mixed media connections112US 5,754,540 AMacronix International Co., Ltd. · 1998