H04M 3/306
For frequencies above the voice frequency
Official title: {for frequencies above the voice frequency, e.g. xDSL line qualification (test methods, test equipment and test arrangements for subscriber lines using xDSL modems H04M3/304; systems modifying transmission characteristics according to link quality H04L1/0001; monitoring and/or testing of line transmission systems H04B3/46)}
H04M3/306 (For frequencies above the voice frequency) appears on 215 US grants and 212 published applications in this corpus.
Search patents in H04M- Granted patents
- 215
- Published applications
- 212
- Assignees
- 79
- Inventors
- 318
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 8 | 3 |
| 2002 | 5 | 4 |
| 2003 | 3 | 4 |
| 2004 | 6 | 8 |
| 2005 | 5 | 17 |
| 2006 | 16 | 13 |
| 2007 | 5 | 17 |
| 2008 | 10 | 11 |
| 2009 | 10 | 10 |
| 2010 | 15 | 10 |
| 2011 | 5 | 13 |
| 2012 | 16 | 18 |
| 2013 | 12 | 13 |
| 2014 | 21 | 18 |
| 2015 | 23 | 19 |
| 2016 | 15 | 8 |
| 2017 | 7 | 6 |
| 2018 | 3 | 5 |
| 2019 | 10 | 4 |
| 2020 | 4 | 3 |
| 2021 | 4 | 2 |
| 2022 | 0 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 2 |
| 2025 | 4 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Broadband access management systems and methods1 Sep 2026US 12,726,566 B2Epic Lane Networks, LP
- Detecting a disconnect at a DSLAM14 Jul 2026US 12,684,062 B2British Telecommunications Public Ltd.Co.
- Detecting modem power state change30 Dec 2025US 12,513,240 B2British Telecommunications Public Ltd.Co.
- DSL fault location2 Sep 2025US 12,407,773 B2British Telecommunications Public Ltd.Co.
- Detecting a loop length change in a digital subscriber line25 Mar 2025US 12,261,978 B1British Telecommunications Public Ltd.Co.
- Detecting a disconnect at a dslam26 Feb 2026US 2026/0059047 A1British Telecommunications Public Ltd.Co.
- Detecting a loop length change in a digital subscriber line3 Apr 2025US 2025/0112989 A1British Telecommunications Public Ltd.Co.
- Detecting modem power state change8 Aug 2024US 2024/0267456 A1British Telecommunications Public Ltd.Co.
- Dsl fault location18 Apr 2024US 2024/0129404 A1British Telecommunications Public Ltd.Co.
- Detecting a single wire interruption6 Oct 2022US 2022/0317173 A1Adtran, Inc.
Most cited
By later US patents
- Detection of bridge tap using frequency domain analysis258US 6,177,801 B1Sunrise Telecom Incorporated · 2001
- Method and system for estimating the ability of a subscriber loop to support broadband services131US 6,091,713 ATelcordia Technologies, Inc. · 2000
- Loop certification and measurement for ADSL125US 6,215,855 B1Bell Atlantic Network Services, Inc. · 2001
- System and method of determining cable characteristics110US 5,128,619 A1992
- Loop certification and measurement for ADSL79US 6,477,238 B1Verizon Services Group · 2002