H04M 3/301
Circuit arrangements at the subscriber's side of the line
Official title: {Circuit arrangements at the subscriber's side of the line}
H04M3/301 (Circuit arrangements at the subscriber's side of the line) appears on 207 US grants and 50 published applications in this corpus.
Search patents in H04M- Granted patents
- 207
- Published applications
- 50
- Assignees
- 114
- Inventors
- 349
- Latest grant
- 4 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 10 | 0 |
| 1984 | 11 | 0 |
| 1985 | 9 | 0 |
| 1986 | 7 | 0 |
| 1987 | 11 | 0 |
| 1988 | 6 | 0 |
| 1989 | 7 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 8 | 0 |
| 1995 | 9 | 0 |
| 1996 | 10 | 0 |
| 1997 | 12 | 0 |
| 1998 | 8 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 12 | 2 |
| 2002 | 7 | 4 |
| 2003 | 11 | 6 |
| 2004 | 2 | 9 |
| 2005 | 3 | 3 |
| 2006 | 8 | 3 |
| 2007 | 4 | 2 |
| 2008 | 3 | 8 |
| 2009 | 3 | 0 |
| 2010 | 4 | 1 |
| 2011 | 1 | 1 |
| 2012 | 1 | 4 |
| 2013 | 5 | 0 |
| 2014 | 3 | 1 |
| 2015 | 1 | 0 |
| 2016 | 1 | 2 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- Home wiring test system with missing filter detection24 Jun 2014US 8,761,350 B2Tollgrade Communications, Inc.
- Detecting a single wire interruption6 Oct 2022US 2022/0317173 A1Adtran, Inc.
- Line test system and line test method1 Sep 2022US 2022/0279368 A1Nippon Telegraph and Telephone Corporation
- Fault analysis device20 Aug 2020US 2020/0267255 A1British Telecommunications Public Ltd.Co.
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- Method and apparatus for transmission line testing10 Nov 2016US 2016/0330316 A1AT&T Intellectual Property I, L. P.
Most cited
By later US patents
- Apparatus and method for testing and fault isolation in a communication network160US 8,472,327 B2Verizon Business Global LLC · 2013
- Loop certification and measurement for ADSL125US 6,215,855 B1Bell Atlantic Network Services, Inc. · 2001
- Telecommunications test system including a test and trouble shooting expert system80US 5,521,958 AHarris Corporation · 1996
- Loop certification and measurement for ADSL79US 6,477,238 B1Verizon Services Group · 2002
- Semiconductor switching device78US 5,285,100 ATexas Instruments Incorporated · 1994