H04L 12/437
Ring fault isolation or reconfiguration
Official title: Ring fault isolation or reconfiguration {(for SDH/SONET ring networks H04J3/085)}
H04L12/437 (Ring fault isolation or reconfiguration) appears on 1,000 US grants and 881 published applications in this corpus.
Search patents in H04L- Granted patents
- 1,000
- Published applications
- 881
- Assignees
- 428
- Inventors
- 2,101
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 7 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 13 | 0 |
| 1986 | 13 | 0 |
| 1987 | 12 | 0 |
| 1988 | 13 | 0 |
| 1989 | 11 | 0 |
| 1990 | 9 | 0 |
| 1991 | 11 | 0 |
| 1992 | 13 | 0 |
| 1993 | 10 | 0 |
| 1994 | 17 | 0 |
| 1995 | 11 | 0 |
| 1996 | 17 | 0 |
| 1997 | 12 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 13 | 0 |
| 2001 | 16 | 3 |
| 2002 | 9 | 20 |
| 2003 | 21 | 60 |
| 2004 | 16 | 31 |
| 2005 | 16 | 31 |
| 2006 | 26 | 38 |
| 2007 | 16 | 38 |
| 2008 | 35 | 38 |
| 2009 | 30 | 53 |
| 2010 | 47 | 60 |
| 2011 | 47 | 56 |
| 2012 | 45 | 63 |
| 2013 | 45 | 53 |
| 2014 | 64 | 53 |
| 2015 | 54 | 46 |
| 2016 | 63 | 36 |
| 2017 | 36 | 29 |
| 2018 | 30 | 32 |
| 2019 | 31 | 23 |
| 2020 | 28 | 36 |
| 2021 | 25 | 24 |
| 2022 | 27 | 16 |
| 2023 | 17 | 9 |
| 2024 | 11 | 14 |
| 2025 | 15 | 11 |
| 2026 | 3 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fast recovery in layer 2 rings using selective replication28 Jul 2026US 12,695,642 B2Cisco Technology, Inc.
- Switching control of communication route28 Apr 2026US 12,615,204 B2Rakuten Mobile, Inc.
- Data transmission method and communication apparatus27 Jan 2026US 12,537,716 B2Huawei Technologies Co., Ltd.
- Method and apparatus for monitoring link state between nodes2 Dec 2025US 12,489,697 B2Zhejiang Lab
- Automated communication channel selection18 Nov 2025US 12,476,772 B1Cox Communications, Inc.
- Managing fate sharing between overlay networks and underlay networks24 Sep 2026US 2026/0291816 A1Cisco Technology, Inc.
- Deployment of redundancy box functionality in a software-defined network13 Aug 2026US 2026/0238512 A1Schweitzer Engineering Laboratories, Inc.
- Anti-loop method for 5gs tsn virtual bridge, device, and storage medium23 Jul 2026US 2026/0213975 A1Zte Corporation
- Packet transmission method and apparatus, device, system, and storage medium25 Jun 2026US 2026/0180826 A1Huawei Technologies Co., Ltd.
- Latency measurement for high-availability seamless redundancy (hsr) rings30 Apr 2026US 2026/0121887 A1Schweitzer Engineering Laboratories, Inc.
Most cited
By later US patents
- Method and apparatus for preventing loops in a network by controlling broadcasts329US 8,615,599 B1Cisco Technology, Inc. · 2013
- Fault tolerant network utilizing bi-directional point-to-point communications links between nodes184US 8,179,787 B2SMSC Holding S.A.R.L. · 2012
- Network system, network terminal, and method for specifying location of failure in network system174US 6,680,903 B1Matsushita Electric Industrial Co., Ltd. · 2004
- Technique establishing a forwarding path in a network system167US 8,817,594 B2Telefonaktiebolaget'l M Ericsson (Publ) · 2014
- Automated communication channel selection161US 11,228,414 B1Cox Communications, Inc. · 2022