F23N 2221/12
Recycling exhaust gases
F23N2221/12 (Recycling exhaust gases) appears on 48 US grants and 34 published applications in this corpus.
Search patents in F23N- Granted patents
- 48
- Published applications
- 34
- Assignees
- 47
- Inventors
- 127
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 2 | 0 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 2 |
| 2009 | 0 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 4 |
| 2012 | 0 | 3 |
| 2013 | 5 | 7 |
| 2014 | 1 | 1 |
| 2015 | 3 | 3 |
| 2016 | 2 | 0 |
| 2017 | 1 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 2 |
| 2022 | 0 | 0 |
| 2023 | 0 | 2 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electronic control device and flow rate measurement system17 Mar 2026US 12,578,091 B2Hitachi Astemo, Ltd.
- Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained1 Dec 2020US 10,851,991 B2Bertelli & Partners S.R.L.
- Turbine engine assembly and method of assembling the same7 May 2019US 10,280,760 B2General Electric Company
- System and method for barrier in passage of combustor of gas turbine engine with exhaust gas recirculation27 Feb 2018US 9,903,588 B2ExxonMobil Upstream Research Company
- Combustion apparatus3 Oct 2017US 9,777,919 B2Kyungdong Navien Co., Ltd.
- Combustion system able to operate with recycling of the combustion gas27 Nov 2025US 2025/0362016 A1Carbodown
- Combustion system using, as an oxidizer, a mixture of molecular oxygen and a dehumidified gas obtained from combustion fumes13 Jun 2024US 2024/0191872 A1Carbodown
- Electronic Control Device and Flow Rate Measurement System21 Dec 2023US 2023/0408087 A1Hitachi Astemo, Ltd.
- Gas-burner device and method for operating a gas-burner device14 Sep 2023US 2023/0288059 A1Viessmann Climate Solutions SE
- Apparatus for Oil Flow Control13 May 2021US 2021/0140635 A1Preferred Utilities Manufacturing Corporation
Most cited
By later US patents
- Variable heat generating method and apparatus129US 4,622,007 AAmerican Combustion, Inc. · 1986
- Method and apparatus for generating highly luminous flame78US 4,797,087 AAmerican Combustion, Inc. · 1989
- Regenerative burner42US 4,923,391 AAmerican Combustion, Inc. · 1990
- Air fuel control system for Stirling engine33US 4,231,222 AFord Motor Company · 1980
- Low nox burner process for boilers31US 5,511,971 A1996