F23J 3/02
Cleaning furnace tubes
Official title: Cleaning furnace tubes; Cleaning flues or chimneys
F23J3/02 (Cleaning furnace tubes) appears on 238 US grants and 164 published applications in this corpus.
Search patents in F23J- Granted patents
- 238
- Published applications
- 164
- Assignees
- 127
- Inventors
- 456
- Latest grant
- 28 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 5 | 0 |
| 1982 | 9 | 0 |
| 1983 | 8 | 0 |
| 1984 | 7 | 0 |
| 1985 | 13 | 0 |
| 1986 | 10 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 1 |
| 2002 | 2 | 5 |
| 2003 | 4 | 6 |
| 2004 | 5 | 7 |
| 2005 | 4 | 4 |
| 2006 | 5 | 9 |
| 2007 | 0 | 4 |
| 2008 | 5 | 9 |
| 2009 | 2 | 10 |
| 2010 | 4 | 8 |
| 2011 | 4 | 11 |
| 2012 | 7 | 8 |
| 2013 | 11 | 12 |
| 2014 | 6 | 10 |
| 2015 | 6 | 8 |
| 2016 | 7 | 7 |
| 2017 | 6 | 4 |
| 2018 | 4 | 6 |
| 2019 | 6 | 2 |
| 2020 | 1 | 3 |
| 2021 | 3 | 9 |
| 2022 | 3 | 11 |
| 2023 | 8 | 3 |
| 2024 | 4 | 2 |
| 2025 | 6 | 1 |
| 2026 | 0 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Chimney cleaning system28 Oct 2025US 12,453,992 B2
- System and methods for controlling operation of a recovery boiler to reduce fouling1 Jul 2025US 12,345,410 B2International Paper Company
- Heat exchanger tube block, exhaust heat recovery boiler, and method of constructing exhaust heat recovery boiler24 Jun 2025US 12,339,077 B2Kawasaki Jukogyo Kabushiki Kaisha
- Scale thickness estimating system, scale thickness estimating method, and scale thickness estimating program6 May 2025US 12,292,275 B2National University Corporation Tokyo University of Marine Science and Technology
- Device and method for producing pressure waves of high amplitude22 Apr 2025US 12,281,791 B2Explo Engineering GmbH
- Forced Air Furnace with a Novel Multi-Path Heat Exchanger Section6 Aug 2026US 2026/0227096 A1
- Telescopic Pulse Ash Blower Capable of Blowing Ash at Multiple Angles and Ash Blowing Method Thereof18 Jun 2026US 2026/0168668 A1Harbin Xiandai Intelligent Equipment Manufacturing Co., Ltd.
- Management of offgas duct accretions in a smelting process30 Apr 2026US 2026/0117331 A1Nucor Corporation
- Chimney cleaning system29 Jan 2026US 2026/0027598 A1
- Protective Device for a Boiler Access Point9 Jan 2025US 2025/0012301 A1Explo Engineering GmbH
Most cited
By later US patents
- Economizer with soot blower59US 4,407,237 AApplied Engineering Co. · 1983
- Method and apparatus for sootblowing recovery boiler49US 6,758,168 B2Metso Automation Oy · 2004
- Method and system for sootblowing optimization42US 6,736,089 B1NeuCo, Inc. · 2004
- Sootblowing optimization system37US 6,325,025 B1Applied Synergistics, Inc. · 2001
- Mitigation of deposits and secondary reactions in thermal conversion processes32US 8,097,090 B2Ensyn Renewables, Inc. · 2012