F04D 29/328
With unequal distribution of blades around the hub
Official title: {with unequal distribution of blades around the hub}
F04D29/328 (With unequal distribution of blades around the hub) appears on 40 US grants and 42 published applications in this corpus.
Search patents in F04D- Granted patents
- 40
- Published applications
- 42
- Assignees
- 37
- Inventors
- 107
- Latest grant
- 29 Nov 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 2 |
| 2003 | 1 | 2 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 2 | 0 |
| 2010 | 2 | 0 |
| 2011 | 1 | 3 |
| 2012 | 0 | 3 |
| 2013 | 0 | 2 |
| 2014 | 2 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 1 |
| 2017 | 2 | 3 |
| 2018 | 0 | 7 |
| 2019 | 7 | 2 |
| 2020 | 2 | 3 |
| 2021 | 2 | 1 |
| 2022 | 5 | 2 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
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- Impeller and fan1 Feb 2022US 11,236,760 B2Delta Electronics, Inc.
- Impeller and axial fan25 Jan 2022US 11,231,045 B2Nidec Corporation
- Impeller blade with uneven spacing29 Aug 2024US 2024/0287999 A1
- Blower and air conditioner3 Aug 2023US 2023/0243360 A1Mitsubishi Electric Corporation
- Centrifugal fan and rotary electric machine14 Jul 2022US 2022/0220971 A1Mitsubishi Electric Corporation
- Impeller and axial fan28 Apr 2022US 2022/0128064 A1Nidec Corporation
- Impeller and axial fan15 Apr 2021US 2021/0108651 A1Nidec Corporation
Most cited
By later US patents
- Low-noise, high-efficiency fan assembly combining unequal blade spacing angles and unequal blade setting angles66US 5,681,145 AITT Automotive Electrical Systems, Inc. · 1997
- Wheel or rotor with a plurality of blades61US 4,253,800 AHitachi, Ltd. · 1981
- Axial flow fan52US 4,474,534 AGeneral Dynamics Corporation · 1984
- Variable skew fan38US 5,000,660 AAirflow Research and Manufacturing Corporation · 1991
- Rotors with mistuned blades26US 5,993,161 ACalifornia Institute of Technology · 1999