H03F 1/20
In discharge-tube amplifiers
Official title: in discharge-tube amplifiers
H03F1/20 (In discharge-tube amplifiers) appears on 10 US grants and 5 published applications in this corpus.
Search patents in H03F- Granted patents
- 10
- Published applications
- 5
- Assignees
- 8
- Inventors
- 9
- Latest grant
- 14 Sep 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 3 | 0 |
| 1983 | 1 | 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 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Vacuum tube amplification system capable of reducing residual noise and a grounding method thereof14 Sep 2021US 11,121,678 B1Echowell Electronic Co., Ltd.
- Bias circuit2 Jun 2020US 10,673,388 B2NXP B. V.
- Grounding structure and grounding method of vacuum tube audio amplifier20 Nov 2018US 10,135,402 B1Echowell Electronics Co., Ltd.
- Method for RIAA correction of audio signal with use of transformer and capacitor17 Feb 2009US 7,493,180 B2Outsource Technologies, Inc.
- Simple self-biased cascode amplifier circuit17 Aug 2004US 6,778,016 B2Koninklijke Philips Eletronics N.V.
- Bias circuit6 Jun 2019US 2019/0173432 A1NXP B. V.
- Riaa correction of audio signal with use of transformer8 Nov 2007US 2007/0257762 A1Outsource Technologies, Inc.
- Method for RIAA correction of audio signal with use of transformer and capacitor13 Oct 2005US 2005/0226443 A1Outsource Technologies, Inc.
- Method for RIAA correction of audio signal with use of transformer6 Oct 2005US 2005/0219031 A1Outsource Technologies, Inc.
- Simple self-biased cascode amplifier circuit6 May 2004US 2004/0085130 A1Koninklijke Philips Electronics N. V.
Most cited
By later US patents
- Simple self-biased cascode amplifier circuit19US 6,778,016 B2Koninklijke Philips Eletronics N.V. · 2004
- Wide band amplifiers8US 4,337,439 AThe Marconi Company Limited · 1982
- Amplifiers3US 4,359,696 AThe Marconi Company Limited · 1982
- Multisignal amplification3US 4,423,386 AThe Marconi Company Limited · 1983
- Electronic amplification systems2US 4,359,695 AThe Marconi Company Limited · 1982