F02D 19/066
Retrofit of secondary fuel supply systems
Official title: {Retrofit of secondary fuel supply systems; Conversion of engines to operate on multiple fuels}
F02D19/066 (Retrofit of secondary fuel supply systems) appears on 112 US grants and 111 published applications in this corpus.
Search patents in F02D- Granted patents
- 112
- Published applications
- 111
- Assignees
- 82
- Inventors
- 212
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
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| 1987 | 1 | 0 |
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| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
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| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 3 |
| 2003 | 2 | 1 |
| 2004 | 1 | 2 |
| 2005 | 2 | 5 |
| 2006 | 2 | 3 |
| 2007 | 4 | 4 |
| 2008 | 6 | 7 |
| 2009 | 4 | 4 |
| 2010 | 2 | 6 |
| 2011 | 3 | 6 |
| 2012 | 4 | 4 |
| 2013 | 0 | 6 |
| 2014 | 2 | 6 |
| 2015 | 4 | 4 |
| 2016 | 4 | 4 |
| 2017 | 3 | 4 |
| 2018 | 5 | 3 |
| 2019 | 1 | 4 |
| 2020 | 2 | 2 |
| 2021 | 4 | 5 |
| 2022 | 5 | 5 |
| 2023 | 5 | 11 |
| 2024 | 9 | 3 |
| 2025 | 6 | 5 |
| 2026 | 0 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for controlling fuel substitution in a dual fuel engine system30 Dec 2025US 12,510,033 B2Cummins Power Generation Inc.
- Supplemental fuel system for compression-ignition engine30 Dec 2025US 12,510,043 B2American CNG, LLC
- Hydrogen-diesel direct injection dual-fuel system for internal combustion engines24 Jun 2025US 12,338,777 B2NewSouth Innovations Pty Limited
- Multi-fuel injector with fuel mixing10 Jun 2025US 12,326,127 B2Caterpillar Inc.
- High oxygen operation of internal combustion engines6 May 2025US 12,292,009 B2Gas Technologies LLC
- Method of operating a hybrid ammonia-diesel compression ignition propulsion system and/or power generation system and controlling the power output and emissions thereof14 May 2026US 2026/0132750 A1Analytical Engineering, Inc.
- System and method for controlling fuel substitution in a dual fuel engine system30 Apr 2026US 2026/0117716 A1Cummins Power Generation Inc.
- Fuel system for engine2 Apr 2026US 2026/0092584 A1American CNG, LLC
- Internal combustion engine system1 Jan 2026US 2026/0002497 A1Volvo Truck Corporation
- Engine device18 Sep 2025US 2025/0290465 A1Yanmar Holdings Co., Ltd.
Most cited
By later US patents
- Bi-fuel control system and retrofit assembly for diesel engines231US 6,543,395 B2Gas Technologies LLC · 2003
- Methods and apparatus for operation of multiple fuel engines199US 7,222,015 B2Engine Control Technology, LLC · 2007
- Multi-fuel engine conversion system and method90US 7,019,626 B1Omnitek Engineering Corporation · 2006
- Apparatus and method for providing an alternative fuel system for engines81US 5,092,305 AGas Research Institute · 1992
- Dual fuel injection system and a method of controlling such a system77US 5,379,740 ABiocom Pty. Ltd. · 1995