F22D 1/36
Water and air preheating systems
F22D1/36 (Water and air preheating systems) appears on 42 US grants and 38 published applications in this corpus.
Search patents in F22D- Granted patents
- 42
- Published applications
- 38
- Assignees
- 33
- Inventors
- 98
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 2 | 2 |
| 2010 | 0 | 4 |
| 2011 | 0 | 0 |
| 2012 | 3 | 1 |
| 2013 | 0 | 3 |
| 2014 | 0 | 1 |
| 2015 | 1 | 4 |
| 2016 | 2 | 3 |
| 2017 | 0 | 0 |
| 2018 | 7 | 6 |
| 2019 | 6 | 1 |
| 2020 | 2 | 2 |
| 2021 | 3 | 1 |
| 2022 | 2 | 2 |
| 2023 | 2 | 2 |
| 2024 | 2 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Conduit preheating control2 Dec 2025US 12,486,981 B2General Electric Company
- Steam boiler system and method of circulating water and steam in a steam boiler system29 Oct 2024US 12,130,011 B2Maxi-Therme Inc.
- Method and system for improving boiler effectiveness27 Aug 2024US 12,072,096 B2Arvos Ljungstrom LLC
- Arrangement for and a method of operating a steam boiler system26 Dec 2023US 11,850,550 B2Sumitomo SHI FW Energia Oy
- Hybrid power generation equipment and control method thereof18 Jul 2023US 11,702,964 B2Doosan Enerbility Co., Ltd.
- Steam boiler system and method of circulating water and steam in a steam boiler system19 Dec 2024US 2024/0418361 A1Maxi-Therme Inc.
- Conduit preheating control3 Oct 2024US 2024/0328619 A1General Electric Company
- Steam boiler system and method of circulating water and steam in a steam boiler system8 Jun 2023US 2023/0175685 A1Maxi-Therme Inc.
- Arrangement for and a method of operating a steam boiler system19 Jan 2023US 2023/0016404 A1Sumitomo SHI FW Energia Oy
- Hybrid power generation equipment and control method thereof5 May 2022US 2022/0136411 A1Doosan Heavy Industries Construction Co., Ltd
Most cited
By later US patents
- Method for optimizing the operating efficiency of a fossil fuel-fired power generation system19US 5,423,272 ACombustion Engineering, Inc. · 1995
- Efficient waste heat recovery process from sulfur containing flue gas14US 4,582,122 ALinde Aktiengesellschaft · 1986
- Method and apparatus for enhanced heat recovery from steam generators and water heaters14US 7,066,396 B2Gas Technology Institute · 2006
- Integrated split stream water coil air heater and economizer (IWE)13US 8,286,595 B2Babcock & Wilcox Power Generation Group, Inc. · 2012
- Steam power plant for generating electric power11US 5,687,674 ASaarbergwerke Aktiengesellschaft · 1997