H03G 7/004
Using continuously variable impedance devices
Official title: {using continuously variable impedance devices}
H03G7/004 (Using continuously variable impedance devices) appears on 77 US grants and 36 published applications in this corpus.
Search patents in H03G- Granted patents
- 77
- Published applications
- 36
- Assignees
- 52
- Inventors
- 117
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 2 |
| 2009 | 1 | 2 |
| 2010 | 2 | 2 |
| 2011 | 2 | 2 |
| 2012 | 3 | 4 |
| 2013 | 1 | 1 |
| 2014 | 2 | 3 |
| 2015 | 3 | 3 |
| 2016 | 3 | 2 |
| 2017 | 2 | 3 |
| 2018 | 3 | 2 |
| 2019 | 5 | 2 |
| 2020 | 2 | 2 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 2 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Signal amplification apparatus based on load resistance control and audio terminal including the same9 Dec 2025US 12,495,254 B2Meewang Inc.
- A/D conversion device and A/D conversion method6 Feb 2024US 11,894,858 B2Yamaha Corporation
- Method for audio peak reduction using all-pass filter23 Jan 2024US 11,881,829 B2Aac Acoustic Technologies (Shenzhen) Co., Ltd.
- Vacuum tube subwoofer extraction circuit system2 Mar 2021US 10,938,364 B2Echowell Electronic Co., Ltd.
- Audio distortion compensation15 Sep 2020US 10,778,173 B2Cirrus Logic, Inc.
- Method for audio peak reduction using all-pass filter2 Nov 2023US 2023/0353112 A1Aac Acoustic Technologies (Shenzhen) Co., Ltd.
- Signal amplification apparatus based on load resistance control and audio terminal including the same12 Oct 2023US 2023/0328440 A1Dreamus Company
- A/d conversion device and a/d conversion method6 Jan 2022US 2022/0006468 A1Yamaha Corporation
- Vacuum tube subwoofer extraction circuit system31 Dec 2020US 2020/0412312 A1Echowell Electronic Co., Ltd.
- Audio distortion compensation30 Jan 2020US 2020/0036356 A1Cirrus Logic International Semiconductor Ltd.
Most cited
By later US patents
- Multiband programmable compression system140US 5,278,912 AResound Corporation · 1994
- Companding noise reduction system with simultaneous encode and decode71US 6,556,685 B1Harman Music Group, Incorporated · 2003
- Volume and compression control in movie theaters65US 7,551,745 B2Dolby Laboratories Licensing Corporation · 2009
- Automatic gain control circuit in a feed forward configuration52US 5,165,017 ASmith & Nephew Richards Inc. · 1992
- Multiband programmable compression system43US 5,488,668 AResound Corporation · 1996