H04L 12/422
Synchronisation for ring networks
Official title: {Synchronisation for ring networks (Time Division Multiplex ring networks, e.g. SDH/SONET H04J3/085)}
H04L12/422 (Synchronisation for ring networks) appears on 130 US grants and 101 published applications in this corpus.
Search patents in H04L- Granted patents
- 130
- Published applications
- 101
- Assignees
- 96
- Inventors
- 233
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 7 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 1 |
| 2003 | 3 | 19 |
| 2004 | 0 | 3 |
| 2005 | 2 | 6 |
| 2006 | 6 | 5 |
| 2007 | 1 | 3 |
| 2008 | 2 | 0 |
| 2009 | 1 | 4 |
| 2010 | 4 | 2 |
| 2011 | 2 | 3 |
| 2012 | 1 | 2 |
| 2013 | 1 | 1 |
| 2014 | 5 | 4 |
| 2015 | 3 | 5 |
| 2016 | 4 | 4 |
| 2017 | 2 | 4 |
| 2018 | 5 | 6 |
| 2019 | 3 | 5 |
| 2020 | 4 | 9 |
| 2021 | 7 | 2 |
| 2022 | 4 | 4 |
| 2023 | 5 | 4 |
| 2024 | 3 | 1 |
| 2025 | 5 | 4 |
By publication year. Applications have been published since 2001.
Recent patents
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Most cited
By later US patents
- 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
- Communications system using rings architecture101US 7,103,008 B2Conexant, Inc. · 2006
- Independent clocking local area network and nodes used for the same57US 5,241,543 AHitachi, Ltd. · 1993
- Loop initialization mechanism for a peer-to-peer communication system56US 4,354,229 AInternational Business Machines Corporation · 1982
- Adaptively synchronized ring network for data communication55US 4,716,575 AApollo Computer, Inc. · 1987