H04H 20/49
For am stereophonic broadcast systems
Official title: for AM stereophonic broadcast systems
H04H20/49 (For am stereophonic broadcast systems) appears on 141 US grants and 8 published applications in this corpus.
Search patents in H04H- Granted patents
- 141
- Published applications
- 8
- Assignees
- 36
- Inventors
- 106
- Latest grant
- 1 Nov 2016
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 12 | 0 |
| 1981 | 4 | 0 |
| 1982 | 12 | 0 |
| 1983 | 24 | 0 |
| 1984 | 15 | 0 |
| 1985 | 8 | 0 |
| 1986 | 6 | 0 |
| 1987 | 14 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 0 |
| 2003 | 0 | 4 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 2 | 1 |
| 2009 | 1 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Quadrature modulation apparatus for AM stereo transmitters1 Nov 2016US 9,485,043 B1
- Carrier phase synchronization system for improved amplitude modulation and television broadcast reception1 Feb 2011US 7,881,416 B2UT-Battelle, LLC
- Carrier phase synchronization system for improved amplitude modulation and television broadcast reception8 Sep 2009US 7,587,017 B2UT-Battelle, LLC
- Method and arrangement for digital transmission using AM transmitters29 Jul 2008US 7,406,131 B2Deutsche Telekom AG
- Receiving circuit for radio-wave clock broadcast wave3 Jun 2008US 7,383,031 B2Sanyo Electric Co., Ltd.
- Portable radio communication apparatus and method of use12 May 2011US 2011/0112988 A1
- Carrier phase synchronization system for improved amplitude modulation and television broadcast reception3 Dec 2009US 2009/0296856 A1UT-Battelle, LLC
- Carrier phase synchronization system for improved amplitude modulation and television broadcast reception10 Jan 2008US 2008/0008285 A1UT-Battelle, LLC
- Receiving circuit for radio-wave clock broadcast wave6 Apr 2006US 2006/0073799 A1Sanyo Electric Co., Ltd.
- Method and arrangement for digital transmission using am emitters7 Aug 2003US 2003/0148743 A1Deutsche Telekom AG
Most cited
By later US patents
- AM compatible digital waveform frame timing recovery and frame synchronous power measurement107US 5,764,706 AUSA Digital Radio Partners, L.P. · 1998
- Clamping circuit for a PLL tuning system48US 4,903,329 AMotorola, Inc. · 1990
- Receiver for AM stereo signals having a circuit for reducing distortion due to overmodulation41US 4,405,835 AU. S. Philips Corporation · 1983
- Noise reducing34US 6,347,146 B1Bose Corporation · 2002
- Reduction of adjacent channel interference33US 4,206,317 A1980