H03F 5/00
Amplifiers with both discharge tubes and semiconductor devices as amplifying elements
H03F5/00 (Amplifiers with both discharge tubes and semiconductor devices as amplifying elements) appears on 50 US grants and 23 published applications in this corpus.
Search patents in H03F- Granted patents
- 50
- Published applications
- 23
- Assignees
- 25
- Inventors
- 63
- Latest grant
- 22 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 2 | 1 |
| 2010 | 0 | 2 |
| 2011 | 2 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 2 |
| 2014 | 1 | 1 |
| 2015 | 3 | 2 |
| 2016 | 6 | 3 |
| 2017 | 5 | 2 |
| 2018 | 2 | 1 |
| 2019 | 2 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 3 |
| 2023 | 1 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Audio amplifier with switchable active components22 Jul 2025US 12,368,416 B2
- Valve amplifiers1 Oct 2024US 12,107,560 B2Blackstar Amplification Ltd.
- Hybrid mode based audio processing method and apparatus therefor12 Sep 2023US 11,757,413 B2Dreamus Company
- Vacuum tube and transistor amplifier natural sound field tone dividing system28 Jul 2020US 10,727,792 B1Echowell Electronic Co., Ltd.
- Steered current source for single-ended class-A amplifier9 Apr 2019US 10,256,776 B1Western Electric Export Corporation
- Valve amplifiers1 Dec 2022US 2022/0385253 A1Blackstar Amplification Ltd.
- Hybrid mode based audio processing method and apparatus therefor20 Oct 2022US 2022/0337195 A1Dreamus Company
- Audio amplifier with switchable active components28 Jul 2022US 2022/0239263 A1
- Bias circuit27 Sep 2018US 2018/0275709 A1RichWave Technology Corp.
- Impedance converter and condenser microphone29 Jun 2017US 2017/0187342 A1Kabushiki Kaisha Audio-Technica
Most cited
By later US patents
- Audio frequency amplifier74US 8,026,765 B22011
- Adjustable distortion guitar amplifier39US 4,495,640 A1985
- Variable control of electronic power supplies34US 5,635,872 AMaven Peal Instruments, Inc. · 1997
- Dual mode music instrument amplifier25US 4,211,893 AMesa Engineering, Inc. · 1980
- Amplifier for driving electrostatic loudspeakers18US 4,324,950 A1982