F28F 5/04
Hollow impellers
Official title: Hollow impellers, e.g. stirring vane
F28F5/04 (Hollow impellers) appears on 20 US grants and 20 published applications in this corpus.
Search patents in F28F- Granted patents
- 20
- Published applications
- 20
- Assignees
- 18
- Inventors
- 50
- Latest grant
- 30 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 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 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 1 | 1 |
| 2016 | 1 | 2 |
| 2017 | 1 | 2 |
| 2018 | 2 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 2 |
| 2021 | 0 | 0 |
| 2022 | 3 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotary heat exchanger30 Sep 2025US 12,429,253 B2Nativus, Inc.
- Rotary heat exchanger20 Feb 2024US 11,906,212 B2Nativus, Inc.
- Rotary heat exchanger26 Jul 2022US 11,397,029 B2Nativus, Inc.
- Heat exchange device and liquid cooling system having the same5 Apr 2022US 11,297,735 B2In Win Development, Inc.
- Reaction device with heat exchanger and use thereof15 Feb 2022US 11,247,188 B2Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
- Rotary heat exchanger27 Aug 2026US 2026/0251358 A1Nativus, Inc.
- Rotary heat exchanger16 Jan 2025US 2025/0020367 A1Nativus, Inc.
- Method for treating a fluid comprising salts and system for implementing the method22 Aug 2024US 2024/0278147 A1Hydromecanique Et Frottement
- Rotary heat exchanger15 Jun 2023US 2023/0184466 A1Nativus, Inc.
- Reaction device with heat exchanger and use thereof28 Apr 2022US 2022/0126250 A1Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
Most cited
By later US patents
- Rotary dryer31US 4,770,236 ABlaw-Knox Food and Chemical Equipment, Inc. · 1988
- Heating and cooling devices, systems and related method16US 10,041,701 B1National Technology & Engineering Solutions of Sandia, LLC · 2018
- Heat exchanger10US 4,039,024 A1977
- Rotary disc type heat exchanger6US 3,951,206 AThe Strong-Scott Mfg. Co. · 1976
- Heat exchange device and liquid cooling system having the same5US 11,297,735 B2In Win Development, Inc. · 2022