H04J 3/0641
Change of the master or reference
Official title: {Change of the master or reference, e.g. take-over or failure of the master}
H04J3/0641 (Change of the master or reference) appears on 531 US grants and 591 published applications in this corpus.
Search patents in H04J- Granted patents
- 531
- Published applications
- 591
- Assignees
- 252
- Inventors
- 1,070
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 9 |
| 2003 | 7 | 4 |
| 2004 | 5 | 11 |
| 2005 | 3 | 7 |
| 2006 | 7 | 6 |
| 2007 | 5 | 9 |
| 2008 | 5 | 17 |
| 2009 | 8 | 18 |
| 2010 | 17 | 33 |
| 2011 | 19 | 32 |
| 2012 | 23 | 20 |
| 2013 | 25 | 22 |
| 2014 | 29 | 33 |
| 2015 | 31 | 24 |
| 2016 | 35 | 30 |
| 2017 | 35 | 32 |
| 2018 | 22 | 18 |
| 2019 | 26 | 19 |
| 2020 | 18 | 24 |
| 2021 | 25 | 46 |
| 2022 | 38 | 41 |
| 2023 | 31 | 39 |
| 2024 | 34 | 40 |
| 2025 | 32 | 41 |
| 2026 | 16 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and a system for creating multi-port network synchronization bridge15 Sep 2026US 12,739,045 B2Coreel Technologies India Private Limited
- Time source signal determination method and apparatus, network device, and storage medium30 Jun 2026US 12,671,511 B2China Mobile Communication Co., Ltd Research Institute
- Precision time protocol redundancy and load balancing across a set of active time servers23 Jun 2026US 12,665,689 B2Meta Platforms, Inc.
- Clock selection in a fronthaul network9 Jun 2026US 12,652,626 B2Rakuten Symphony, Inc.
- System and method for selecting PTP sources in a network with IWF assisted boundary clocks19 May 2026US 12,634,030 B2Ciena Corporation
- Network test apparatus and time source selection method thereof24 Sep 2026US 2026/0291635 A1Anritsu Corporation
- Method and network device for ptp clock synchronization20 Aug 2026US 2026/0246552 A1Telefonaktiebolaget LM Ericsson (publ)
- Enhanced restart of nodes after interruption30 Jul 2026US 2026/0222169 A1Net Insight AB
- Selecting a Best Available Precision Time Protocol (PTP) Backup when a Global Navigation Satellite System (GNSS) Clock Source is Unavailable16 Jul 2026US 2026/0205220 A1Ciena Corporation
- Improving Holdover of a PTP Network in BTCA using Frequency Support2 Jul 2026US 2026/0189313 A1Ciena Corporation
Most cited
By later US patents
- Method and device for the synchronised restitution of data flows167US 7,710,941 B2Barix AG · 2010
- Communication control apparatus and method153US 7,158,488 B2Yamaha Corporation · 2007
- Two-wire bus system comprising a clock wire and a data wire for interconnecting a number of stations and allowing both long-format and short-format slave addresses114US 5,559,502 A1996
- Data communication system and method and communication controller and method therefor, having a data/clock synchronizer and method111US 4,677,614 AEMC Controls, Inc. · 1987
- Synchronized network of electronic devices including back-up master units87US 5,751,220 ASensormatic Electronics Corporation · 1998