H04B 3/21
Using a set of bandfilters
Official title: using a set of bandfilters
H04B3/21 (Using a set of bandfilters) appears on 69 US grants and 56 published applications in this corpus.
Search patents in H04B- Granted patents
- 69
- Published applications
- 56
- Assignees
- 62
- Inventors
- 148
- Latest grant
- 24 Feb 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 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 3 | 5 |
| 2015 | 1 | 3 |
| 2016 | 5 | 1 |
| 2017 | 1 | 1 |
| 2018 | 2 | 10 |
| 2019 | 9 | 5 |
| 2020 | 3 | 2 |
| 2021 | 4 | 4 |
| 2022 | 3 | 8 |
| 2023 | 4 | 4 |
| 2024 | 6 | 6 |
| 2025 | 3 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Transceiver with shared filter for both transmit and receive modes24 Feb 2026US 12,562,777 B2Apple Inc.
- Network using asymmetric uplink and downlink baud rates to reduce crosstalk24 Jun 2025US 12,341,570 B2Marvell Asia Pte Ltd
- Flexible diplexer with dynamically configurable band-split in hybrid fiber coax deployments11 Mar 2025US 12,250,177 B2HyperX Logic, Inc.
- Network optimization for mitigation of crosstalk between network links14 Jan 2025US 12,199,692 B2Marvell Asia Pte Ltd
- System and method for processing audio data into a plurality of frequency components3 Sep 2024US 12,080,303 B2Immersion Networks, Inc.
- Flexible Diplexer with Dynamically Configurable Band-Split in Hybrid Fiber Coax Deployments5 Jun 2025US 2025/0184106 A1HyperX Logic, Inc.
- Power line carrier communication apparatus, method, and system15 Aug 2024US 2024/0275430 A1Hoymiles Power Electronics Inc.
- Transceiver with Shared Filter for both Transmit and Receive Modes11 Jul 2024US 2024/0235609 A9Apple Inc.
- Network using asymmetric uplink and downlink baud rates to reduce crosstalk11 Jul 2024US 2024/0235611 A1Marvell Asia Pte Ltd
- Flexible Diplexer with Dynamically Configurable Band-Split in Hybrid Fiber Coax Deployments13 Jun 2024US 2024/0195597 A1Coherent Logix, Incorporated
Most cited
By later US patents
- Method and apparatus for echo cancellation with discrete multitone modulation116US 5,317,596 AThe Board of Trustees of the Leland Stanford Junior University · 1994
- Echo cancelling device with frequency sub-band filtering86US 4,956,838 AEtat Francais represente par le Ministre des Postes, Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications) · 1990
- Method of identifying an unknown system with a band-splitting adaptive filter and a device thereof83US 5,517,435 ANEC Corporation · 1996
- Method and apparatus for reducing residual far-end echo in voice communication networks82US 5,587,998 AAT&T Corp. · 1996
- Information communication system70US 6,246,716 B1Adtran, Inc. · 2001