H04B 3/493
Testing echo effects or singing
H04B3/493 (Testing echo effects or singing) appears on 87 US grants and 83 published applications in this corpus.
Search patents in H04B- Granted patents
- 87
- Published applications
- 83
- Assignees
- 58
- Inventors
- 146
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 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 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 3 |
| 2003 | 2 | 3 |
| 2004 | 3 | 7 |
| 2005 | 9 | 14 |
| 2006 | 4 | 2 |
| 2007 | 4 | 6 |
| 2008 | 2 | 2 |
| 2009 | 2 | 3 |
| 2010 | 5 | 4 |
| 2011 | 1 | 3 |
| 2012 | 5 | 2 |
| 2013 | 5 | 4 |
| 2014 | 6 | 4 |
| 2015 | 6 | 4 |
| 2016 | 3 | 1 |
| 2017 | 1 | 4 |
| 2018 | 3 | 5 |
| 2019 | 5 | 2 |
| 2020 | 3 | 1 |
| 2021 | 1 | 2 |
| 2022 | 3 | 1 |
| 2023 | 0 | 0 |
| 2024 | 3 | 3 |
| 2025 | 2 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Smart amplifier diagnostic systems and methods15 Sep 2026US 12,738,976 B2Avago Technologies International Sales Pte. Limited
- Ethernet device that performs cable diagnosis by using IEEE 802.3 compliant waveform and associated ethernet cable diagnosis method5 May 2026US 12,621,021 B2Airoha Technology Corp.
- Detecting modem power state change30 Dec 2025US 12,513,240 B2British Telecommunications Public Ltd.Co.
- Interface conversion apparatus, communication system, and echo cancellation method and apparatus5 Aug 2025US 12,381,595 B1Shenzhen Hollyland Technology Co., Ltd.
- Automotive physical layer (PHY) cable fault diagnosis3 Dec 2024US 12,160,279 B2Marvell Asia Pte Ltd
- Interface conversion apparatus, communication system, and echo cancellation method and apparatus24 Jul 2025US 2025/0240051 A1Shenzhen Hollyland Technology Co., Ltd.
- Ethernet device that performs cable diagnosis by using ieee 802.3 compliant waveform and associated ethernet cable diagnosis method15 May 2025US 2025/0158656 A1Airoha Technology Corp.
- Detection apparatus, detection method, and detection program8 Aug 2024US 2024/0267083 A1Sumitomo Electric Industries, Ltd.
- Detecting modem power state change8 Aug 2024US 2024/0267456 A1British Telecommunications Public Ltd.Co.
- Smart amplifier diagnostic systems and methods16 May 2024US 2024/0162934 A1Avago Technologies International Sales Pte. Limited
Most cited
By later US patents
- Method and apparatus for transmission line analysis268US 6,934,655 B2Mindspeed Technologies, Inc. · 2005
- Device and method for network communications and diagnostics186US 6,532,215 B1Cisco Technology, Inc. · 2003
- System and circuitry for measuring echoes on subscriber loops147US 6,819,744 B1Telcordia Technologies, Inc. · 2004
- AC power line network simulator65US 6,141,634 AInternational Business Machines Corporation · 2000
- Transmission line analyzer for automatically identifying the severities and locations of multiple mismatches59US 4,630,228 ASystron Donner Corporation · 1986