F22D
Preheating, or accumulating preheated, feed-water for steam generation
Official title: Preheating, or accumulating preheated, feed-water for steam generation; feed-water supply for steam generation; controlling water level for steam generation; auxiliary devices for promoting water circulation within steam boilers
F22D (Preheating, or accumulating preheated, feed-water for steam generation) appears on 579 US grants and 452 published applications in this corpus.
Search patents in F22D- Granted patents
- 579
- Published applications
- 452
- Assignees
- 320
- Inventors
- 1,334
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 12 | 0 |
| 1978 | 8 | 0 |
| 1979 | 6 | 0 |
| 1980 | 12 | 0 |
| 1981 | 11 | 0 |
| 1982 | 10 | 0 |
| 1983 | 9 | 0 |
| 1984 | 21 | 0 |
| 1985 | 12 | 0 |
| 1986 | 18 | 0 |
| 1987 | 18 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 5 | 0 |
| 1993 | 6 | 0 |
| 1994 | 7 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 12 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 3 |
| 2002 | 7 | 6 |
| 2003 | 4 | 1 |
| 2004 | 1 | 5 |
| 2005 | 3 | 4 |
| 2006 | 8 | 15 |
| 2007 | 5 | 5 |
| 2008 | 2 | 11 |
| 2009 | 9 | 12 |
| 2010 | 3 | 15 |
| 2011 | 4 | 13 |
| 2012 | 9 | 17 |
| 2013 | 7 | 35 |
| 2014 | 9 | 34 |
| 2015 | 21 | 36 |
| 2016 | 22 | 25 |
| 2017 | 22 | 28 |
| 2018 | 33 | 28 |
| 2019 | 35 | 28 |
| 2020 | 22 | 24 |
| 2021 | 28 | 23 |
| 2022 | 23 | 24 |
| 2023 | 22 | 20 |
| 2024 | 18 | 19 |
| 2025 | 12 | 10 |
| 2026 | 12 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
Recent patents
- Comprehensive energy utilization system for coupling carbon capture, energy storage, and thermal power generation18 Aug 2026US 12,710,000 B2Exax Energy Technology (Shenzhen) Co., Ltd
- Power generation facility28 Jul 2026US 12,692,803 B2Kabushiki Kaisha Toshiba
- Integrated control logic device and operating method thereof to control water level of steam generator of nuclear power plant26 May 2026US 12,638,171 B2Kepco Engineering & Construction Company, Inc.
- Electronic cooking apparatus having steam supply device26 May 2026US 12,638,190 B2LG Electronics Inc.
- Heat exchanger baffles and methods for manufacturing the same19 May 2026US 12,631,409 B2Bradford White Corporation
- Economizer and boiler8 Oct 2026US 2026/0309323 A1Kurita Water Industries Ltd.
- Building Emission Processing and/or Sequestration Systems and Methods10 Sep 2026US 2026/0266457 A1Carbonquest, Inc.
- Building Emission Processing and/or Sequestration Systems and Methods27 Aug 2026US 2026/0251297 A1Carbonquest, Inc.
- Method for Generating Steam and Steam Generation Device20 Aug 2026US 2026/0243418 A1Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
- Power Generation System Employing Power Amplifying Thermo-Mechanical Inverter Technology16 Jul 2026US 2026/0204916 A1Kalindha Rashmi LLC
Most cited
By later US patents
- Combined boiler feed and condensate pump124US 5,215,448 AIngersoll-Dresser Pump Company · 1993
- Heat engine system having a selectively configurable working fluid circuit82US 9,874,112 B2Echogen Power Systems, LLC · 2018
- Inhibition of scale deposition from steam generation fluids76US 4,476,930 AUnion Oil Company of California · 1984
- Hot to cold steam transformer for turbine systems70US 7,174,715 B2Siemens Power Generation, Inc. · 2007
- Method for production of high pressure steam from produced water54US 7,591,309 B2Aquatech International Corporation · 2009