H03F 1/327
To emulate discharge tube amplifier characteristics
Official title: {to emulate discharge tube amplifier characteristics}
H03F1/327 (To emulate discharge tube amplifier characteristics) appears on 67 US grants and 24 published applications in this corpus.
Search patents in H03F- Granted patents
- 67
- Published applications
- 24
- Assignees
- 25
- Inventors
- 67
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 5 | 0 |
| 1998 | 11 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 3 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 3 |
| 2008 | 1 | 3 |
| 2009 | 2 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 0 | 2 |
| 2014 | 0 | 1 |
| 2015 | 2 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 2 | 2 |
| 2020 | 2 | 2 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Amplifier connected with a plurality of speakers14 Oct 2025US 12,445,094 B2Roland Corporation
- Amplifier for music signal and method of outputting waveform of music signal6 Jun 2023US 11,670,272 B2Roland Corporation
- Amplifier matching in a digital amplifier modeling system2 Nov 2021US 11,164,551 B2
- Amplifier30 May 2024US 2024/0178799 A1Roland Corporation
- Amplifier30 May 2024US 2024/0178802 A1Roland Corporation
- Amplifier for music signal and method of outputting waveform of music signal1 Jul 2021US 2021/0201879 A1Roland Corporation
- Amplifier matching in a digital amplifier modeling system3 Sep 2020US 2020/0279546 A1
- Load box and sound quality improving method14 May 2020US 2020/0153392 A1Roland Corporation
Most cited
By later US patents
- Tube modeling programmable digital guitar amplification system79US 5,789,689 A1998
- Audio amplifier65US 4,797,633 AVideo Sound, Inc. · 1989
- Signal distortion circuit and method of use43US 4,150,253 AInter-Technology Exchange Ltd. · 1979
- Adjustable distortion guitar amplifier39US 4,495,640 A1985
- Semiconductor emulation of tube amplifiers35US 4,995,084 A1991