H03K 3/04
By the use, as active elements, of vacuum tubes only, with positive
Official title: by the use, as active elements, of vacuum tubes only, with positive feedback (H03K3/023, H03K3/027 take precedence)
H03K3/04 (By the use, as active elements, of vacuum tubes only, with positive) appears on 26 US grants and 22 published applications in this corpus.
Search patents in H03K- Granted patents
- 26
- Published applications
- 22
- Assignees
- 20
- Inventors
- 49
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 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 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 2 | 2 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 2 | 3 |
| 2017 | 2 | 1 |
| 2018 | 0 | 1 |
| 2019 | 3 | 1 |
| 2020 | 1 | 3 |
| 2021 | 2 | 2 |
| 2022 | 0 | 2 |
| 2023 | 2 | 2 |
| 2024 | 4 | 4 |
| 2025 | 2 | 0 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Input buffer circuit9 Jun 2026US 12,652,029 B2Taiwan Semiconductor Manufacturing Company.Ltd
- Device and method for high power-density thermionic energy conversion14 Apr 2026US 12,603,266 B2Space Charge, LLC
- Oscillator monitoring circuits for different oscillator domains31 Mar 2026US 12,592,703 B2Allegro MicroSystems, LLC
- Schmitt trigger with pull-up transistor9 Dec 2025US 12,494,773 B2STMicroelectronics International N. V.
- Time domain-based power supply droop detector4 Nov 2025US 12,463,622 B1Advanced Micro Devices, Inc.
- Input buffer circuit17 Sep 2026US 2026/0280536 A1Taiwan Semiconductor Manufacturing Company.Ltd
- Oscillator monitoring circuits for different oscillator domains31 Oct 2024US 2024/0364353 A1Allegro MicroSystems, LLC
- Oscillator monitoring circuits for different oscillator domains13 Jun 2024US 2024/0195424 A1Allegro MicroSystems, LLC
- Schmitt trigger with pull-up transistor6 Jun 2024US 2024/0186991 A1STMicroelectronics International N. V.
- Input buffer circuit21 Mar 2024US 2024/0097662 A1Taiwan Semiconductor Manufacturing Company.Ltd
Most cited
By later US patents
- Clock integrated circuit20US 7,961,027 B1Macronix International Co., Ltd. · 2011
- Dynamic latch circuitry12US 6,087,872 AAdvanced Micro Devices, Inc. · 2000
- Clock integrated circuit7US 8,217,698 B2Macronix International Co., Ltd. · 2012
- Variable frequency relaxation oscillator6US 9,401,703 B1Freescale Semiconductor, Inc. · 2016
- Thermionic wave generator (TWG)3US 10,388,496 B2Space Charge, LLC · 2019