H04M 3/302
Using modulation techniques for copper pairs
Official title: {using modulation techniques for copper pairs (for ISDN systems H04M3/245; ISDN selection or connection testing arrangements H04Q11/045)}
H04M3/302 (Using modulation techniques for copper pairs) appears on 307 US grants and 238 published applications in this corpus.
Search patents in H04M- Granted patents
- 307
- Published applications
- 238
- Assignees
- 149
- Inventors
- 518
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 11 | 0 |
| 1996 | 3 | 0 |
| 1997 | 8 | 0 |
| 1998 | 7 | 0 |
| 1999 | 7 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 2 |
| 2002 | 5 | 10 |
| 2003 | 6 | 10 |
| 2004 | 10 | 10 |
| 2005 | 13 | 13 |
| 2006 | 12 | 19 |
| 2007 | 14 | 17 |
| 2008 | 9 | 21 |
| 2009 | 11 | 18 |
| 2010 | 16 | 22 |
| 2011 | 18 | 9 |
| 2012 | 14 | 10 |
| 2013 | 16 | 12 |
| 2014 | 21 | 13 |
| 2015 | 13 | 13 |
| 2016 | 16 | 10 |
| 2017 | 6 | 7 |
| 2018 | 8 | 3 |
| 2019 | 7 | 4 |
| 2020 | 2 | 2 |
| 2021 | 2 | 3 |
| 2022 | 2 | 2 |
| 2023 | 3 | 4 |
| 2024 | 3 | 3 |
| 2025 | 3 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Detecting modem power state change30 Dec 2025US 12,513,240 B2British Telecommunications Public Ltd.Co.
- Systems, methods, and storage media for testing local loops of telecommunications networks10 Jun 2025US 12,328,410 B2Level 3 Communications, LLC
- Easy DSL signal detector4 Mar 2025US 12,244,471 B2CenturyLink Intellectual Property LLC
- Measuring and analyzing data to generate recommendations associated with a digital subscription line (DSL)16 Jul 2024US 12,040,847 B2Viavi Solutions Inc.
- Systems, methods, and storage media for testing local loops of telecommunications networks11 Jun 2024US 12,010,261 B2Level 3 Communications, LLC
- Easy dsl signal detector19 Jun 2025US 2025/0202781 A1CenturyLink Intellectual Property LLC
- Measuring and analyzing data to generate recommendations associated with a digital subscription line (dsl)3 Oct 2024US 2024/0333336 A1Viavi Solutions Inc.
- Systems, methods, and storage media for testing local loops of telecommunications networks3 Oct 2024US 2024/0333833 A1Level 3 Communications, LLC
- Detecting modem power state change8 Aug 2024US 2024/0267456 A1British Telecommunications Public Ltd.Co.
- Systems, methods, and storage media for testing local loops of telecommunications networks14 Sep 2023US 2023/0291829 A1Level 3 Communications, LLC
Most cited
By later US patents
- Alarm and test system for a digital added main line169US 5,111,497 ARaychem Corporation · 1992
- Method and apparatus for determining the origin of a remote alarm indication signal162US 5,790,531 AApplied Digital Access, Inc. · 1998
- Method and apparatus for delivering secured telephone service in hybrid coaxial cable network147US 5,469,495 AU S West Advanced Technologies, Inc. · 1995
- Loop extender with communications, control, and diagnostics109US 7,194,023 B22Wire, Inc. · 2007
- Test instrument for testing asymmetric digital subscriber lines103US 6,002,671 AFluke Corporation · 1999