F04D 29/325
For axial flow fans
Official title: {for axial flow fans (blade mountings F04D29/34, blades F04D29/38)}
F04D29/325 (For axial flow fans) appears on 1,363 US grants and 1,649 published applications in this corpus.
Search patents in F04D- Granted patents
- 1,363
- Published applications
- 1,649
- Assignees
- 488
- Inventors
- 2,564
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 7 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 8 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 11 | 0 |
| 1994 | 7 | 0 |
| 1995 | 7 | 0 |
| 1996 | 8 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 11 | 0 |
| 2000 | 13 | 0 |
| 2001 | 9 | 4 |
| 2002 | 23 | 18 |
| 2003 | 16 | 22 |
| 2004 | 9 | 26 |
| 2005 | 12 | 24 |
| 2006 | 22 | 34 |
| 2007 | 16 | 26 |
| 2008 | 8 | 25 |
| 2009 | 13 | 26 |
| 2010 | 14 | 23 |
| 2011 | 14 | 33 |
| 2012 | 21 | 42 |
| 2013 | 12 | 47 |
| 2014 | 22 | 53 |
| 2015 | 36 | 84 |
| 2016 | 43 | 167 |
| 2017 | 66 | 216 |
| 2018 | 101 | 164 |
| 2019 | 178 | 111 |
| 2020 | 154 | 103 |
| 2021 | 105 | 78 |
| 2022 | 111 | 76 |
| 2023 | 71 | 66 |
| 2024 | 76 | 49 |
| 2025 | 40 | 76 |
| 2026 | 36 | 56 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Aircraft with an unducted fan propulsor6 Oct 2026US 12,752,923 B2General Electric Company
- Axial fan assembly including an intermediate shroud6 Oct 2026US 12,753,773 B2Regal Beloit America, Inc.
- Flexible support structure for a geared architecture gas turbine engine29 Sep 2026US 12,747,675 B2Rtx Corporation
- Impeller22 Sep 2026US 12,742,457 B2Carrier Japan Corporation
- Fan blade retention system and related methods8 Sep 2026US 12,729,693 B2Delta T, LLC
- Axial fan comprising endplates at the tip of the blades24 Sep 2026US 2026/0286965 A1R.E.M. Patents S.R.L.
- Rotor assembly with interchangeable blades24 Sep 2026US 2026/0286972 A1Rescue South, Inc.
- Fan module17 Sep 2026US 2026/0276003 A1Shenzhen Jisu Technology Co., Ltd
- Hub housing27 Aug 2026US 2026/0251153 A1Hanon Systems
- Axial flow fan20 Aug 2026US 2026/0243263 A1Usui Co., Ltd.
Most cited
By later US patents
- Blade for axial fan133US 5,437,541 A1995
- Dynamically sealing ring fan shroud assembly105US 6,599,088 B2BorgWarner Inc. · 2003
- Fan blade with curved planform and high-lift airfoil having bulbous leading edge98US 5,624,234 AITT Automotive Electrical Systems, Inc. · 1997
- Low noise fan97US 4,358,245 ABolt Beranek and Newman Inc. · 1982
- Housing with recirculation control for use with banded axial-flow fans95US 5,489,186 AAirflow Research and Manufacturing Corporation · 1996