H03F 1/33
In discharge-tube amplifiers
Official title: in discharge-tube amplifiers
H03F1/33 (In discharge-tube amplifiers) appears on 14 US grants and 7 published applications in this corpus.
Search patents in H03F- Granted patents
- 14
- Published applications
- 7
- Assignees
- 7
- Inventors
- 19
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 2 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tube amplifier13 Jan 2026US 12,525,936 B2
- Audio amplifier with switchable active components22 Jul 2025US 12,368,416 B2
- Amplifier device, audio device, and method for controlling amplifier device13 Aug 2024US 12,063,012 B2Moriyama Meiboku Co., Ltd.
- Analog amplification vacuum tube13 Jul 2021US 11,062,871 B2Noritake Co., Limited
- Low voltage tube circuits26 Feb 2019US 10,216,205 B2
- Amplifier device, audio device, and method for controlling amplifier device6 Jun 2024US 2024/0186959 A1Moriyama Meiboku Co., Ltd.
- Tube amplifier29 Feb 2024US 2024/0072742 A1
- Audio amplifier with switchable active components28 Jul 2022US 2022/0239263 A1
- Analog amplification vacuum tube15 Oct 2020US 2020/0328057 A1Noritake Co., Limited
- Low Voltage Tube Circuits16 Nov 2017US 2017/0329359 A1
Most cited
By later US patents
- Amplitude-modulated broadcast transmitter for various types of modulation, in particular DSB, SSB and ISB7US 5,438,686 AThomcast AG · 1995
- Output power selection apparatus for a tube-type audio amplifier5US 5,550,509 A1996
- Low voltage tube circuits3US 10,063,194 B12018
- Amplifiers3US 4,359,696 AThe Marconi Company Limited · 1982
- Tube type power amplifier with distortion control3US 5,668,499 APeavey Electronics Corporation · 1997