F04D 29/424
Double entry casings
Official title: {Double entry casings}
F04D29/424 (Double entry casings) appears on 184 US grants and 219 published applications in this corpus.
Search patents in F04D- Granted patents
- 184
- Published applications
- 219
- Assignees
- 127
- Inventors
- 459
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 4 |
| 2003 | 2 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 4 | 9 |
| 2007 | 3 | 3 |
| 2008 | 0 | 2 |
| 2009 | 0 | 4 |
| 2010 | 2 | 2 |
| 2011 | 2 | 1 |
| 2012 | 1 | 5 |
| 2013 | 2 | 5 |
| 2014 | 2 | 10 |
| 2015 | 6 | 9 |
| 2016 | 6 | 5 |
| 2017 | 4 | 10 |
| 2018 | 8 | 10 |
| 2019 | 6 | 14 |
| 2020 | 13 | 19 |
| 2021 | 14 | 21 |
| 2022 | 14 | 28 |
| 2023 | 24 | 17 |
| 2024 | 23 | 15 |
| 2025 | 17 | 13 |
| 2026 | 7 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Neck fan18 Aug 2026US 12,710,047 B1Shenzhen Jisu Technology Co., Ltd
- Hoods for extracting cooking fumes, comprising first and second suction units18 Aug 2026US 12,710,181 B2Elica S.P.A.
- Fan cover16 Jun 2026US 12,655,854 B2ABB Schweiz AG
- Neck fan2 Jun 2026US 12,644,462 B2Shenzhen Jisu Technology Co., Ltd
- Cooking hob with extractor hood5 May 2026US 12,618,568 B2Elica S.P.A.
- Stacked fan structure, combined blade-integrated fan and automotive seat ventilation system13 Aug 2026US 2026/0235132 A1Aew Technology Group Co., Ltd.
- Volute, fan and air conditioner30 Jul 2026US 2026/0218722 A1Gd Midea Air-Conditioning Equipment Co., Ltd.
- Centrifugal fan, neck fan, and vortex shell assembly23 Jul 2026US 2026/0210367 A1Shenzhen Jisu Technology Co., Ltd
- Impeller for a fan and a range hood25 Jun 2026US 2026/0177059 A1Whirlpool (China) Co., Ltd.
- Cooling fan and electronic device4 Jun 2026US 2026/0156771 A1Sony Interactive Entertainment Inc.
Most cited
By later US patents
- Fan motor38US 6,348,748 B1Toshiba Home Technology Corporation · 2002
- Fan casing volute35US 4,599,042 ACoolair Corporation Pte. Ltd. · 1986
- Acoustic treatment for fans33US 4,174,020 A1979
- Bi-directional blowers for cooling computers23US 7,255,532 B22007
- Cooling radiator21US 5,816,319 ANippon Keiki Works, Ltd. · 1998