H03F 3/1855
With junction-fet devices
Official title: {with junction-FET devices}
H03F3/1855 (With junction-fet devices) appears on 36 US grants and 19 published applications in this corpus.
Search patents in H03F- Granted patents
- 36
- Published applications
- 19
- Assignees
- 30
- Inventors
- 56
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 2 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 3 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 2 | 4 |
| 2024 | 2 | 1 |
| 2025 | 1 | 0 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Audio signal reproduction19 May 2026US 12,634,640 B2
- Musical instrument preamplifier7 Jan 2025US 12,191,818 B2
- Valve amplifiers1 Oct 2024US 12,107,560 B2Blackstar Amplification Ltd.
- Pre-amplification conditioning circuit for a transducer audio device25 Jun 2024US 12,021,490 B2Logitech Europe S. A.
- Pre-amplification conditioning circuit for a transducer audio device25 Jul 2023US 11,711,058 B1Logitech Europe S. A.
- Microphone for capturing sound26 Mar 2026US 2026/0089420 A1DPA Microphones A/S
- Methods and apparatus to regulate an amplifier5 Mar 2026US 2026/0066856 A1Texas Instruments Incorporated
- Methods and apparatus to regulate an amplifier5 Mar 2026US 2026/0066857 A1Texas Instruments Incorporated
- Audio signal reproduction11 Apr 2024US 2024/0120892 A1Tenor, Inc.
- Pre-amplification conditioning circuit for a transducer audio device17 Aug 2023US 2023/0261617 A1Logitech Europe S. A.
Most cited
By later US patents
- Low noise amplifier for microphone31US 5,589,799 ATibbetts Industries, Inc. · 1996
- Self-biasing, low noise amplifier of extended dynamic range30US 5,097,224 ATelex Communications, Inc. · 1992
- Field effect transistor amplifier25US 4,021,751 ASony Corporation · 1977
- Amplifier device for a condenser microphone23US 5,579,397 AMatsushita Electric Industrial Co., Ltd. · 1996
- Low noise-high gain JFET amplifier for a piezoelectric transducer17US 4,214,215 AContact Communication Corporation · 1980