H04J 3/0644
External master-clock
Official title: {External master-clock}
H04J3/0644 (External master-clock) appears on 426 US grants and 460 published applications in this corpus.
Search patents in H04J- Granted patents
- 426
- Published applications
- 460
- Assignees
- 222
- Inventors
- 806
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 9 | 3 |
| 2002 | 6 | 18 |
| 2003 | 4 | 8 |
| 2004 | 6 | 8 |
| 2005 | 6 | 9 |
| 2006 | 13 | 1 |
| 2007 | 7 | 11 |
| 2008 | 12 | 10 |
| 2009 | 9 | 15 |
| 2010 | 4 | 16 |
| 2011 | 10 | 13 |
| 2012 | 12 | 13 |
| 2013 | 10 | 26 |
| 2014 | 17 | 28 |
| 2015 | 31 | 18 |
| 2016 | 20 | 26 |
| 2017 | 24 | 20 |
| 2018 | 31 | 19 |
| 2019 | 29 | 22 |
| 2020 | 19 | 28 |
| 2021 | 25 | 34 |
| 2022 | 26 | 32 |
| 2023 | 29 | 24 |
| 2024 | 21 | 32 |
| 2025 | 25 | 17 |
| 2026 | 13 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System information block delivery in sidelink6 Oct 2026US 12,757,140 B2QUALCOMM Incorporated
- Systems and methods for watermarking time, place and identity of events8 Sep 2026US 12,732,293 B2Hoptroff London Limited
- Time synchronization method and time synchronization device1 Sep 2026US 12,726,289 B2Moxa Inc.
- Trusted or attested packet timestamping9 Jun 2026US 12,652,228 B2Amazon Technologies, Inc.
- Validating synchronized local times of at least a first and a second control unit2 Jun 2026US 12,647,194 B2Bayerische Motoren Werke Aktiengesellschaft
- Selecting a Best Available Clock for Synchronization Recovery27 Aug 2026US 2026/0254548 A1Ciena Corporation
- Systems and methods for inter-tool synchronization21 May 2026US 2026/0142737 A1Schlumberger Technology Corporation
- GNSS Time Synchronization in Redundant Systems30 Apr 2026US 2026/0118833 A1Waymo LLC
- Monitoring and Selecting a Stable and Best PTP Master in a Packet Network2 Apr 2026US 2026/0095271 A1Ciena Corporation
- Timestamp control loop19 Mar 2026US 2026/0081707 A1Mellanox Technologies, Ltd.
Most cited
By later US patents
- System and method for synchronizing operations among a plurality of independently clocked digital data processing devices1,949US 8,234,395 B2Sonos, Inc. · 2012
- Method of manually fine tuning audio synchronization of a home network269US 7,333,519 B2Gateway, Inc. · 2008
- Systems and methods for synchronizing operations among a plurality of independently clocked digital data processing devices without a voltage controlled crystal oscillator262US 8,370,678 B2Sonos, Inc. · 2013
- Systems and methods for synchronizing operations among a plurality of independently clocked digital data processing devices without a voltage controlled crystal oscillator171US 8,020,023 B2Sonos, Inc. · 2011
- Synchronizing clock signals of server and client devices in a network system based on power source synchronous pulse signal168US 7,263,110 B2D&M Holdings, Inc. · 2007