H03H 21/0001
Analogue adaptive filters
Official title: {Analogue adaptive filters}
H03H21/0001 (Analogue adaptive filters) appears on 122 US grants and 79 published applications in this corpus.
Search patents in H03H- Granted patents
- 122
- Published applications
- 79
- Assignees
- 65
- Inventors
- 176
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 5 | 3 |
| 2003 | 8 | 7 |
| 2004 | 5 | 8 |
| 2005 | 6 | 13 |
| 2006 | 10 | 3 |
| 2007 | 4 | 2 |
| 2008 | 5 | 4 |
| 2009 | 4 | 5 |
| 2010 | 6 | 2 |
| 2011 | 9 | 2 |
| 2012 | 3 | 2 |
| 2013 | 4 | 7 |
| 2014 | 4 | 5 |
| 2015 | 8 | 5 |
| 2016 | 8 | 1 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 2 |
| 2020 | 1 | 2 |
| 2021 | 1 | 1 |
| 2022 | 2 | 0 |
| 2023 | 2 | 1 |
| 2024 | 0 | 3 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Adaptive radio frequency filter with improved linearity17 Feb 2026US 12,555,882 B2Thales
- Near-zero latency analog bi-quad infinite impulse response filter27 Jun 2023US 11,689,393 B1The Boeing Company
- Time-adaptive RF hybrid filter structures28 Mar 2023US 11,616,492 B1L3Harris Technologies, Inc.
- Sensor module16 Aug 2022US 11,417,824 B2Kabushiki Kaisha Toshiba
- Precision digital to analog conversion in the presence of variable and uncertain fractional bit contributions21 Jun 2022US 11,368,163 B2Advanced Energy Industries, Inc.
- Adaptive logic board for variable speed drive for heating, ventilation, air conditioning and refrigeration system16 May 2024US 2024/0159415 A1Johnson Controls Air Conditioning and Refrigeration (Wuxi) Co., Ltd.
- In-memory analog channel equalization4 Apr 2024US 2024/0113698 A1Intel Corporation
- Factorizing vectors by utilizing resonator networks15 Feb 2024US 2024/0054178 A1International Business Machines Corporation
- Adaptive radio frequency filter with improved linearity8 Jun 2023US 2023/0178867 A1Thales
- Precision digital to analog conversion in the presence of variable and uncertain fractional bit contributions20 May 2021US 2021/0152181 A1Advanced Energy Industries, Inc.
Most cited
By later US patents
- Adaptive radio transceiver with low noise amplification211US 6,417,737 B1Broadcom Corporation · 2002
- Integral switched capacitor FIR filter/digital-to-analog converter for sigma-delta encoded digital audio127US 5,012,245 AAT&T Bell Laboratories · 1991
- Multiplier/adder circuit91US 4,521,907 AAmerican Microsystems, Inc. · 1985
- Method and apparatus for filter tuning84US 6,677,814 B2Microtune (San Diego), Inc. · 2004
- Adaptive radio transceiver with floating MOSFET capacitors79US 6,920,311 B2Broadcom Corporation · 2005