F02D 21/06
Peculiar to engines having other non-fuel gas added to combustion air
Official title: peculiar to engines having other non-fuel gas added to combustion air
F02D21/06 (Peculiar to engines having other non-fuel gas added to combustion air) appears on 601 US grants and 397 published applications in this corpus.
Search patents in F02D- Granted patents
- 601
- Published applications
- 397
- Assignees
- 186
- Inventors
- 1,304
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 14 | 0 |
| 1978 | 18 | 0 |
| 1979 | 13 | 0 |
| 1980 | 25 | 0 |
| 1981 | 23 | 0 |
| 1982 | 17 | 0 |
| 1983 | 8 | 0 |
| 1984 | 13 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 5 | 0 |
| 1991 | 0 | 0 |
| 1992 | 6 | 0 |
| 1993 | 8 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 6 | 0 |
| 1997 | 3 | 0 |
| 1998 | 13 | 0 |
| 1999 | 5 | 0 |
| 2000 | 26 | 0 |
| 2001 | 24 | 7 |
| 2002 | 16 | 10 |
| 2003 | 12 | 10 |
| 2004 | 11 | 11 |
| 2005 | 10 | 10 |
| 2006 | 6 | 3 |
| 2007 | 6 | 5 |
| 2008 | 5 | 13 |
| 2009 | 2 | 6 |
| 2010 | 5 | 9 |
| 2011 | 7 | 17 |
| 2012 | 5 | 23 |
| 2013 | 7 | 35 |
| 2014 | 19 | 36 |
| 2015 | 32 | 44 |
| 2016 | 36 | 35 |
| 2017 | 40 | 37 |
| 2018 | 30 | 20 |
| 2019 | 26 | 22 |
| 2020 | 33 | 19 |
| 2021 | 16 | 4 |
| 2022 | 7 | 5 |
| 2023 | 6 | 5 |
| 2024 | 7 | 7 |
| 2025 | 5 | 4 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Stratified nitrogen enriched air (NEA) strategies and methods to reduce NOx emissions from engines12 May 2026US 12,624,654 B2Saudi Arabian Oil Company
- Exhaust gas recirculation and aftertreatment control30 Dec 2025US 12,510,036 B2Perkins Engines Company Limited
- Internal combustion engine and a method for operating an internal combustion engine5 Aug 2025US 12,378,921 B2Innio Jenbacher GmbH & Co OG
- Piston for compression-ignition engine having antebowl and engine operating strategy utilizing same8 Jul 2025US 12,352,200 B2Caterpillar Inc.
- Fuel injection control device for internal combustion engine20 May 2025US 12,305,589 B2Toyota Jidosha Kabushiki Kaisha
- Internal combustion engine and a method for operating an internal combustion engine20 Nov 2025US 2025/0354525 A1Innio Jenbacher GmbH & Co OG
- Control system for internal combustion engine, internal combustion engine configured to control combusion, and method of control thereof16 Oct 2025US 2025/0320839 A1Cummins Power Generation Inc.
- Stratified nitrogen enriched air (nea) strategies and methods to reduce nox emissions from engines31 Jul 2025US 2025/0243799 A1Saudi Arabian Oil Company
- Engine8 May 2025US 2025/0146446 A1Yanmar Power Technology Co., Ltd.
- Internal combustion engine and a method for operating an internal combustion engine31 Oct 2024US 2024/0360796 A1Innio Jenbacher GmbH & Co OG
Most cited
By later US patents
- Dual converter engine exhaust system for reducing hydrocarbon emissions137US 5,125,231 ACorning Incorporated · 1992
- Sequential turbocharger system for an internal combustion engine135US 5,142,866 AToyota Jidosha Kabushiki Kaisha · 1992
- Internal combustion engine with an exhaust gas recirculation system118US 5,740,786 AMercedes-Benz AG · 1998
- Method of controlling reciprocating four-stroke internal combustion engines107US 4,700,684 AFEV Forschungsgesellschaft fur Energietechnik und Verbrennungsmotoren mbH · 1987
- Exhaust gas purification device for an internal combustion engine105US 5,732,554 AToyota Jidosha Kabushiki Kaisha · 1998