F04D 29/663
Sound attenuation
Official title: {Sound attenuation}
F04D29/663 (Sound attenuation) appears on 840 US grants and 924 published applications in this corpus.
Search patents in F04D- Granted patents
- 840
- Published applications
- 924
- Assignees
- 468
- Inventors
- 2,100
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 6 | 0 |
| 1989 | 1 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 8 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 10 | 0 |
| 1996 | 10 | 0 |
| 1997 | 13 | 0 |
| 1998 | 13 | 0 |
| 1999 | 7 | 0 |
| 2000 | 11 | 0 |
| 2001 | 9 | 6 |
| 2002 | 12 | 16 |
| 2003 | 16 | 10 |
| 2004 | 5 | 11 |
| 2005 | 8 | 17 |
| 2006 | 7 | 14 |
| 2007 | 8 | 16 |
| 2008 | 6 | 31 |
| 2009 | 8 | 16 |
| 2010 | 15 | 26 |
| 2011 | 23 | 33 |
| 2012 | 21 | 23 |
| 2013 | 15 | 31 |
| 2014 | 24 | 44 |
| 2015 | 24 | 52 |
| 2016 | 26 | 58 |
| 2017 | 45 | 63 |
| 2018 | 52 | 67 |
| 2019 | 81 | 71 |
| 2020 | 62 | 48 |
| 2021 | 48 | 39 |
| 2022 | 45 | 41 |
| 2023 | 43 | 52 |
| 2024 | 41 | 41 |
| 2025 | 43 | 49 |
| 2026 | 26 | 49 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Torso aerator22 Sep 2026US 12,742,458 B2
- Air guide ring and axial flow fan comprising same8 Sep 2026US 12,729,697 B2Tyco Fire & Security GmbH
- Portable fan device1 Sep 2026US 12,723,591 B2
- Detuning device and method18 Aug 2026US 12,710,059 B2Sulzer Management AG
- Blower / vac tools with improved fan blade noise11 Aug 2026US 12,704,128 B2Milwaukee Electric Tool Corporation
- Variable bleed valve assemblies8 Oct 2026US 2026/0309077 A1General Electric Company
- Noise reduction air inlet bypass recirculation structure of compressor8 Oct 2026US 2026/0309167 A1Harbin Engineering University
- Techniques for Using Floodlight LEDs When Imaging Sensors Have an Insufficient Level of Detail for Identifying Hand Gestures, and Mixed-Reality Systems and Methods of Using These Techniques24 Sep 2026US 2026/0292120 A1Meta Platforms Technologies, LLC
- Serrated impeller blades3 Sep 2026US 2026/0258812 A1Danfoss A/S
- Noise attenuation for nuclear imaging system27 Aug 2026US 2026/0251158 A1Siemens Medical Solutions USA, Inc.
Most cited
By later US patents
- Blower with bearing tube333US 8,636,479 B2ResMed Motor Technologies Inc. · 2014
- System for reducing noise in a hydraulic fracturing fleet263US 9,587,649 B2U.S. Well Services, LLC · 2017
- Mounting body127US 6,216,691 B1ResMed Limited · 2001
- Combination bulk absorber-honeycomb acoustic panels122US 4,235,303 AThe Boeing Company · 1980
- Low noise air blower113US 5,567,127 A1996