H04M 1/76
Compensating for differences in line impedance
H04M1/76 (Compensating for differences in line impedance) appears on 107 US grants and 31 published applications in this corpus.
Search patents in H04M- Granted patents
- 107
- Published applications
- 31
- Assignees
- 71
- Inventors
- 163
- Latest grant
- 21 Jan 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 5 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 1 |
| 2002 | 5 | 3 |
| 2003 | 5 | 6 |
| 2004 | 5 | 4 |
| 2005 | 3 | 1 |
| 2006 | 5 | 2 |
| 2007 | 5 | 2 |
| 2008 | 2 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 2 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 2 | 3 |
| 2014 | 3 | 1 |
| 2015 | 0 | 0 |
| 2016 | 2 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 2 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Detecting and reducing feedback21 Jan 2020US 10,540,983 B2Sorenson IP Holdings, LLC
- Impedance matching circuit of communication apparatus1 Oct 2019US 10,432,164 B2Electronics and Telecommunications Research Institute
- Communication device4 Sep 2018US 10,069,963 B2Oki Data Corporation
- Method for correcting telephone signal degradation caused by the length of the analog line via the receiver7 Jun 2016US 9,363,364 B2Sagemcom Broadband SAS
- Apparatus and control method for the same29 Mar 2016US 9,300,788 B2Canon Kabushiki Kaisha
- Detecting and reducing feedback6 Dec 2018US 2018/0350378 A1Sorenson IP Holdings, LLC
- Impedance matching circuit of communication apparatus14 Jun 2018US 2018/0167048 A1Electronics and Telecommunications Research Institute
- Communication device2 Mar 2017US 2017/0064074 A1Oki Data Corporation
- Apparatus and control method for the same3 Jul 2014US 2014/0185791 A1Canon Kabushiki Kaisha
- System and method for optimizing termination impedance for an analog telephone line19 Dec 2013US 2013/0336463 A1Adtran, Inc.
Most cited
By later US patents
- Portable hybrid communication system and methods458US 4,972,457 ASpectrum Information Technologies, Inc. · 1990
- Adaptive transmission line impedance matching device and method116US 6,724,890 B1Premisenet Incorporated · 2004
- Balanced hybrid circuit54US 5,822,426 AInternational Business Machines Corporation · 1998
- Pots splitter with line impedance matching52US 6,895,089 B2ADC DSL Systems, Inc. · 2005
- Subscriber line impedance measurement device and method48US 5,465,287 ATeledata Communication Ltd. · 1995