H04J 3/0623
Synchronous multiplexing systems
Official title: {Synchronous multiplexing systems, e.g. synchronous digital hierarchy/synchronous optical network (SDH/SONET), synchronisation with a pointer process}
H04J3/0623 (Synchronous multiplexing systems) appears on 209 US grants and 97 published applications in this corpus.
Search patents in H04J- Granted patents
- 209
- Published applications
- 97
- Assignees
- 85
- Inventors
- 403
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 7 | 0 |
| 1993 | 8 | 0 |
| 1994 | 14 | 0 |
| 1995 | 7 | 0 |
| 1996 | 18 | 0 |
| 1997 | 12 | 0 |
| 1998 | 10 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 0 |
| 2002 | 4 | 12 |
| 2003 | 4 | 7 |
| 2004 | 7 | 12 |
| 2005 | 11 | 6 |
| 2006 | 7 | 8 |
| 2007 | 7 | 7 |
| 2008 | 12 | 4 |
| 2009 | 7 | 2 |
| 2010 | 5 | 3 |
| 2011 | 9 | 2 |
| 2012 | 7 | 5 |
| 2013 | 3 | 1 |
| 2014 | 2 | 2 |
| 2015 | 6 | 3 |
| 2016 | 2 | 4 |
| 2017 | 4 | 4 |
| 2018 | 1 | 1 |
| 2019 | 2 | 0 |
| 2020 | 1 | 4 |
| 2021 | 2 | 1 |
| 2022 | 3 | 1 |
| 2023 | 2 | 1 |
| 2024 | 0 | 4 |
| 2025 | 2 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Data transmission method and apparatus, network device, system, and storage medium14 Apr 2026US 12,603,721 B2Zte Corporation
- Clock frequency synchronization method and communication apparatus7 Apr 2026US 12,598,015 B2Huawei Technologies Co., Ltd.
- Holdover mode device, method and measurement and adjustment module12 Aug 2025US 12,388,548 B2Fiber Logic Communications, Inc.
- Methods, systems, and media for modifying the presentation of contextually relevant documents in browser windows of a browsing application8 Apr 2025US 12,271,412 B2Google Inc.
- Methods, systems, and media for modifying the presentation of contextually relevant documents in browser windows of a browsing application12 Dec 2023US 11,841,887 B2Google Inc.
- Method and System for Time Synchronization of Sensor Units25 Jun 2026US 2026/0180705 A1Siemens Aktiengesellschaft
- Holdover mode device9 Oct 2025US 2025/0317231 A1Fiber Logic Communications, Inc.
- Methods, systems, and media for modifying the presentation of contextually relevant documents in browser windows of a browsing application24 Jul 2025US 2025/0238453 A1Google Inc.
- Holdover mode device, method and measurement and adjustment module5 Sep 2024US 2024/0297726 A1Fiber Logic Communications, Inc.
- Data transmission method and apparatus, network device, system, and storage medium27 Jun 2024US 2024/0214104 A1Zte Corporation
Most cited
By later US patents
- Facilities data link handler in a performance monitoring and test system76US 5,703,871 AApplied Digital Access, Inc. · 1997
- Virtual tributary cross connect switch and switch network utilizing the same75US 4,998,242 ATranSwitch Corporation · 1991
- Multicast packet duplication at random node or at egress port with frame synchronization73US 6,751,219 B1Aztech Partners, Inc. · 2004
- Method and system for hit-less switching69US 6,195,330 B12001
- Method and apparatus for using SONET overheat to align multiple inverse multiplexed data streams61US 5,461,622 ABell Communications Research, Inc. · 1995