H03H 21/0021
Notch filters
Official title: {Notch filters}
H03H21/0021 (Notch filters) appears on 27 US grants and 22 published applications in this corpus.
Search patents in H03H- Granted patents
- 27
- Published applications
- 22
- Assignees
- 23
- Inventors
- 40
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 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 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 1 |
| 2012 | 1 | 5 |
| 2013 | 4 | 2 |
| 2014 | 2 | 3 |
| 2015 | 4 | 1 |
| 2016 | 2 | 2 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 2 | 1 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 2 |
| 2025 | 0 | 0 |
| 2026 | 3 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Adaptive filter device and method for providing an output signal6 Oct 2026US 12,756,379 B2u-blox AG
- Micromirror resonance supression using configurable filter14 Jul 2026US 12,683,585 B2Microsoft Technology Licensing, LLC
- Gate driver for a low dropout voltage regulator24 Feb 2026US 12,562,631 B2NXP B. V.
- Motor control apparatus4 Aug 2020US 10,734,933 B2Mitsubishi Electric Corporation
- Systems and methods for providing compensation of analog filter bandedge ripple using LPF2 Jul 2019US 10,340,893 B1Marvell International Ltd.
- Adaptive filter device and method for providing an output signal27 Jun 2024US 2024/0213960 A1u-blox AG
- Gate driver for a low dropout voltage regulator4 Apr 2024US 2024/0113612 A1NXP B. V.
- Micromirror resonance supression using configurable filter30 Nov 2023US 2023/0384582 A1Microsoft Technology Licensing, LLC
- Motor control apparatus25 Apr 2019US 2019/0123672 A1Mitsubishi Electric Corporation
- Digital filter and vehicle driving force control apparatus2 Mar 2017US 2017/0057509 A1Toyota Jidosha Kabushiki Kaisha
Most cited
By later US patents
- Receiver and adaptive digital notch filter199US 5,226,057 ARockwell International Corporation · 1993
- Programmable RF notch filter for envelope tracking97US 9,020,451 B2RF Micro Devices, Inc. · 2015
- Self-adjusting digital notch filter28US 3,967,102 AThe United States of America as represented by the Secretary of the Air Force · 1976
- Adaptive frequency correction burst detector for GSM handset system28US 5,724,657 ARockwell International Corporation · 1998
- Adaptive sinusoidal interference filter15US 4,589,083 ACentre de Recherche Industrielle du Quebec · 1986