F02M 31/04
Combustion-air or fuel-air mixture
Official title: combustion-air or fuel-air mixture (electrically F02M31/12; by using heat from working cylinders or cylinder heads F02M31/14; heating of combustion-air as an engine starting aid F02N7/04)
F02M31/04 (Combustion-air or fuel-air mixture) appears on 655 US grants and 328 published applications in this corpus.
Search patents in F02M- Granted patents
- 655
- Published applications
- 328
- Assignees
- 264
- Inventors
- 1,089
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 38 | 0 |
| 1977 | 22 | 0 |
| 1978 | 31 | 0 |
| 1979 | 17 | 0 |
| 1980 | 22 | 0 |
| 1981 | 18 | 0 |
| 1982 | 22 | 0 |
| 1983 | 15 | 0 |
| 1984 | 18 | 0 |
| 1985 | 21 | 0 |
| 1986 | 14 | 0 |
| 1987 | 9 | 0 |
| 1988 | 11 | 0 |
| 1989 | 12 | 0 |
| 1990 | 13 | 0 |
| 1991 | 15 | 0 |
| 1992 | 9 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 10 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 8 | 0 |
| 2000 | 8 | 0 |
| 2001 | 15 | 2 |
| 2002 | 11 | 14 |
| 2003 | 8 | 12 |
| 2004 | 13 | 13 |
| 2005 | 12 | 12 |
| 2006 | 3 | 12 |
| 2007 | 16 | 17 |
| 2008 | 6 | 14 |
| 2009 | 15 | 10 |
| 2010 | 8 | 7 |
| 2011 | 9 | 25 |
| 2012 | 8 | 16 |
| 2013 | 10 | 13 |
| 2014 | 16 | 17 |
| 2015 | 7 | 15 |
| 2016 | 11 | 19 |
| 2017 | 22 | 15 |
| 2018 | 16 | 20 |
| 2019 | 12 | 15 |
| 2020 | 12 | 13 |
| 2021 | 21 | 15 |
| 2022 | 15 | 6 |
| 2023 | 10 | 6 |
| 2024 | 2 | 5 |
| 2025 | 5 | 10 |
| 2026 | 5 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hybrid drive and fuel vaporizer for UAV and other mobile environments18 Aug 2026US 12,709,419 B2LiquidPiston, Inc.
- Reconfigurable surgical frame and method for use thereof26 May 2026US 12,637,993 B2Warsaw Orthopedic, Inc.
- Temperature control apparatus for a gaseous medium31 Mar 2026US 12,590,766 B2AVL List GmbH
- Temperature control apparatus for a gaseous medium17 Feb 2026US 12,553,671 B2AVL List GmbH
- System and method for controlling a fuel supply system20 Jan 2026US 12,529,345 B2Volvo Truck Corporation
- Fuel-based heating to enable mixing controlled combustion of small- molecule fuels10 Sep 2026US 2026/0266248 A1
- Intake temperature management systems for compression ignition of small molecule fuels10 Sep 2026US 2026/0266249 A1
- Fuel reforming system of diesel vehicle21 May 2026US 2026/0139647 A1Hyundai Motor Company
- Engine system, fuel vaporization system, and method for vaporizing a secondary liquid fuel7 May 2026US 2026/0126022 A1Cummins Power Generation Inc.
- Fuel supply device and engine system30 Apr 2026US 2026/0117731 A1Yanmar Holdings Co., Ltd.
Most cited
By later US patents
- Method and apparatus for operation of combustion engines205US 6,155,212 A2000
- Premixed charge compression ignition engine with optimal combustion control196US 6,276,334 B1Cummins Engine Company, Inc. · 2001
- Internal combustion engine with an exhaust gas recirculation system118US 5,740,786 AMercedes-Benz AG · 1998
- HCCI engine intake/exhaust systems for fast inlet temperature and pressure control with intake pressure boosting117US 6,675,579 B1Ford Global Technologies, LLC · 2004
- Method and apparatus for improved operation of internal combustion engines115US 5,343,699 A1994