H03F 3/22
With tubes only
Official title: with tubes only (H03F3/24 takes precedence)
H03F3/22 (With tubes only) appears on 35 US grants and 25 published applications in this corpus.
Search patents in H03F- Granted patents
- 35
- Published applications
- 25
- Assignees
- 22
- Inventors
- 50
- Latest grant
- 1 Oct 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 1 | 2 |
| 2007 | 2 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 2 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 2 | 0 |
| 2016 | 4 | 4 |
| 2017 | 2 | 2 |
| 2018 | 6 | 2 |
| 2019 | 3 | 2 |
| 2020 | 2 | 1 |
| 2021 | 0 | 1 |
| 2022 | 1 | 2 |
| 2023 | 1 | 0 |
| 2024 | 3 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Valve amplifiers1 Oct 2024US 12,107,560 B2Blackstar Amplification Ltd.
- Amplifier device, audio device, and method for controlling amplifier device13 Aug 2024US 12,063,012 B2Moriyama Meiboku Co., Ltd.
- Signal transmitter13 Feb 2024US 11,901,923 B2Huawei Technologies Co., Ltd.
- Programmable analog beamformer13 Jun 2023US 11,677,146 B2
- Broadband high power amplifier27 Sep 2022US 11,456,702 B2Rohde & Schwarz GmbH & Co.KG
- Amplifier device, audio device, and method for controlling amplifier device6 Jun 2024US 2024/0186959 A1Moriyama Meiboku Co., Ltd.
- Valve amplifiers1 Dec 2022US 2022/0385253 A1Blackstar Amplification Ltd.
- Signal Transmitter22 Sep 2022US 2022/0302937 A1Huawei Technologies Co., Ltd.
- Programmable analog beamformer28 Oct 2021US 2021/0336336 A1
- Broadband high power amplifier30 Jan 2020US 2020/0036334 A1Rohde & Schwarz GmbH & Co.KG
Most cited
By later US patents
- Amplifiers with improved isolation11US 8,975,968 B2QUALCOMM Incorporated · 2015
- Amplifier with mains voltage reduction10US 5,091,700 A1992
- Cathode-follower high-fidelity power amplifier8US 5,859,565 A1999
- Doherty power amplifier6US 9,800,209 B2Xi'an Zhongxing New Software Co., Ltd. · 2017
- Vacuum tube power amplifier switchable between push-pull and single ended configurations5US 7,173,488 B2Mesa/Boogie, Ltd. · 2007