H04L 45/18
Loop-free operations
H04L45/18 (Loop-free operations) appears on 697 US grants and 728 published applications in this corpus.
Search patents in H04L- Granted patents
- 697
- Published applications
- 728
- Assignees
- 245
- Inventors
- 1,288
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 6 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 2 |
| 2002 | 4 | 11 |
| 2003 | 11 | 33 |
| 2004 | 11 | 11 |
| 2005 | 4 | 16 |
| 2006 | 21 | 28 |
| 2007 | 4 | 29 |
| 2008 | 16 | 26 |
| 2009 | 28 | 39 |
| 2010 | 41 | 30 |
| 2011 | 39 | 28 |
| 2012 | 29 | 27 |
| 2013 | 23 | 46 |
| 2014 | 42 | 44 |
| 2015 | 47 | 53 |
| 2016 | 57 | 42 |
| 2017 | 38 | 36 |
| 2018 | 36 | 34 |
| 2019 | 52 | 27 |
| 2020 | 27 | 27 |
| 2021 | 28 | 40 |
| 2022 | 31 | 30 |
| 2023 | 32 | 22 |
| 2024 | 24 | 28 |
| 2025 | 18 | 8 |
| 2026 | 13 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Identifying a loop in an external network6 Oct 2026US 12,756,656 B2Hewlett Packard Enterprise Development LP
- Loop avoidance communications method, device, and system4 Aug 2026US 12,701,074 B2Huawei Technologies Co., Ltd.
- Connectivity aware path finding26 May 2026US 12,640,984 B2ECI Telecom Ltd.
- Adding network services to MPLS network26 May 2026US 12,641,016 B2Huawei Technologies Co., Ltd.
- Bit index explicit replication fast reroute14 Apr 2026US 12,603,831 B2Huawei Technologies Co., Ltd.
- Forwarding Topology for BUM Traffic in Network Device Aggregation Group1 Oct 2026US 2026/0303510 A1Arista Networks, Inc.
- Loop Detection and Prevention in Multi-Protocol Routing Environment6 Aug 2026US 2026/0230421 A1Ciena Corporation
- Method and apparatus for determining designated forwarder, and network device30 Jul 2026US 2026/0222333 A1Zte Corporation
- 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.
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
- Synchronization mechanism for link state packet routing279US 5,265,092 ADigital Equipment Corporation · 1993
- Methods and systems for hitless switch management module failover and upgrade275US 7,483,370 B1Extreme Networks, Inc. · 2009
- Responsive routing control method and apparatus263US 5,903,545 AMotorola, Inc. · 1999
- Congestion control for connectionless traffic in data networks via alternate routing197US 5,253,248 AAT&T Bell Laboratories · 1993