F22D 1/28
Feed-water heaters, i.e. economisers or like preheaters: for direct heat transfer
Official title: for direct heat transfer, e.g. by mixing water and steam
F22D1/28 (Feed-water heaters, i.e. economisers or like preheaters: for direct heat transfer) appears on 26 US grants and 21 published applications in this corpus.
Search patents in F22D- Granted patents
- 26
- Published applications
- 21
- Assignees
- 27
- Inventors
- 63
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 2 |
| 2002 | 3 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 3 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 2 | 2 |
| 2018 | 1 | 2 |
| 2019 | 0 | 0 |
| 2020 | 4 | 2 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 1 |
| 2024 | 2 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Multimode direct injection heater assembly30 Dec 2025US 12,510,242 B2Prosonix Limited
- System and method for warmkeeping sub-critical steam generator12 Mar 2024US 11,927,344 B2General Electric Technology GmbH
- System to achieve full combustion turbine load in HRSG limited combined cycle plants6 Feb 2024US 11,892,160 B1HRST, Inc.
- Method of efficiency enhancement of fired heaters without air preheat systems31 Oct 2023US 11,802,687 B2Uop LLC
- Spray nozzle and deaerator8 Dec 2020US 10,859,258 B2Mitsubishi Power, Ltd.
- System and method for warmkeeping sub-critical steam generator29 Jun 2023US 2023/0204206 A1General Electric Technology GmbH
- Method of efficiency enhancement of fired heaters without air preheat systems11 Aug 2022US 2022/0252254 A1Uop LLC
- Multimode direct injection heater assembly14 Apr 2022US 2022/0113021 A1Prosonix Limited
- Injection Feedwater Heater for Steam Power Generating System6 Feb 2020US 2020/0041120 A1
- Steam Power Generating System with Injection Feedwater Heater6 Feb 2020US 2020/0041121 A1
Most cited
By later US patents
- Hot to cold steam transformer for turbine systems70US 7,174,715 B2Siemens Power Generation, Inc. · 2007
- Mixed-flow feedwater heater having a regulating device23US 4,207,842 ABBC Brown, Boveri & Company, Limited · 1980
- Deaerator tray for a steam boiler feedwater heater system17US 4,759,315 ACrane Co. · 1988
- Apparatus for conserving thermal energy in a central heating system16US 6,427,724 B2Zhuhai Velocity of Sound Technology Limited · 2002
- Deaerator tray for a steam boiler feedwater heater system14US 4,981,113 ACrane Co. · 1991