H03F 1/305
In case of switching on or off of a power supply
Official title: {in case of switching on or off of a power supply}
H03F1/305 (In case of switching on or off of a power supply) appears on 393 US grants and 318 published applications in this corpus.
Search patents in H03F- Granted patents
- 393
- Published applications
- 318
- Assignees
- 214
- Inventors
- 705
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 10 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 7 | 0 |
| 1997 | 9 | 0 |
| 1998 | 6 | 0 |
| 1999 | 7 | 0 |
| 2000 | 6 | 0 |
| 2001 | 4 | 1 |
| 2002 | 5 | 7 |
| 2003 | 9 | 8 |
| 2004 | 5 | 13 |
| 2005 | 6 | 13 |
| 2006 | 15 | 14 |
| 2007 | 13 | 17 |
| 2008 | 8 | 28 |
| 2009 | 11 | 17 |
| 2010 | 21 | 21 |
| 2011 | 14 | 19 |
| 2012 | 31 | 25 |
| 2013 | 19 | 16 |
| 2014 | 15 | 14 |
| 2015 | 18 | 9 |
| 2016 | 20 | 11 |
| 2017 | 12 | 15 |
| 2018 | 15 | 11 |
| 2019 | 12 | 5 |
| 2020 | 10 | 10 |
| 2021 | 8 | 9 |
| 2022 | 9 | 6 |
| 2023 | 3 | 5 |
| 2024 | 5 | 3 |
| 2025 | 4 | 15 |
| 2026 | 1 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Analog output circuit and inverter including same3 Mar 2026US 12,567,846 B2Ls Electric Co., Ltd.
- Circuit chip with power supply noise rejection20 May 2025US 12,308,800 B2Realtek Semiconductor Corp.
- Switching audio amplifier with improved voltage supply control13 May 2025US 12,301,183 B2Skyworks Solutions, Inc.
- Audio amplifier circuitry22 Apr 2025US 12,283,929 B2Cirrus Logic, Inc.
- Audio amplifer with fast wake-up power supply1 Apr 2025US 12,267,049 B2RGB Systems, Inc.
- Audio amplification device2 Jul 2026US 2026/0189188 A1Elite Semiconductor Microelectronics Technology Inc.
- Integrated circuit for class-d audio amplifier and associated control method11 Jun 2026US 2026/0163536 A1Monolithic Power Systems, Inc.
- Class-D amplifier21 May 2026US 2026/0142628 A1Realtek Semiconductor Corp.
- Method for adaptively adjusting start-up time of audio amplifier and associated system on chip7 May 2026US 2026/0128719 A1Elite Semiconductor Microelectronics Technology Inc.
- Boost droop catcher19 Mar 2026US 2026/0081566 A1Skyworks Solutions, Inc.
Most cited
By later US patents
- Electronic device having sound output module1,021US 7,046,082 B2Rohm Co., Ltd. · 2006
- Amplifier using a single polarity power supply and including depletion mode FET and negative voltage generator107US 5,892,400 AAnadigics, Inc. · 1999
- Silent start class D amplifier97US 5,805,020 AHarris Corporation · 1998
- Integrated circuit device64US 5,760,652 AMitsubishi Denki Kabushiki Kaisha · 1998
- Apparatus and methods for capacitive load reduction61US 8,598,950 B2Skyworks Solutions, Inc. · 2013