F02M 31/02
Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture: for heating
Official title: for heating ({F02M31/005 takes precedence;} for purifying liquid fuel F02M37/30)
F02M31/02 (Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture: for heating) appears on 1,755 US grants and 982 published applications in this corpus.
Search patents in F02M- Granted patents
- 1,755
- Published applications
- 982
- Assignees
- 587
- Inventors
- 2,910
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 62 | 0 |
| 1977 | 41 | 0 |
| 1978 | 57 | 0 |
| 1979 | 32 | 0 |
| 1980 | 47 | 0 |
| 1981 | 37 | 0 |
| 1982 | 61 | 0 |
| 1983 | 74 | 0 |
| 1984 | 62 | 0 |
| 1985 | 60 | 0 |
| 1986 | 40 | 0 |
| 1987 | 43 | 0 |
| 1988 | 29 | 0 |
| 1989 | 38 | 0 |
| 1990 | 30 | 0 |
| 1991 | 34 | 0 |
| 1992 | 28 | 0 |
| 1993 | 20 | 0 |
| 1994 | 24 | 0 |
| 1995 | 24 | 0 |
| 1996 | 13 | 0 |
| 1997 | 18 | 0 |
| 1998 | 22 | 0 |
| 1999 | 24 | 0 |
| 2000 | 25 | 0 |
| 2001 | 39 | 8 |
| 2002 | 33 | 37 |
| 2003 | 25 | 32 |
| 2004 | 33 | 44 |
| 2005 | 32 | 50 |
| 2006 | 26 | 37 |
| 2007 | 28 | 47 |
| 2008 | 22 | 44 |
| 2009 | 28 | 48 |
| 2010 | 25 | 53 |
| 2011 | 35 | 65 |
| 2012 | 34 | 50 |
| 2013 | 46 | 47 |
| 2014 | 45 | 46 |
| 2015 | 33 | 48 |
| 2016 | 26 | 44 |
| 2017 | 50 | 47 |
| 2018 | 34 | 47 |
| 2019 | 41 | 38 |
| 2020 | 32 | 28 |
| 2021 | 38 | 28 |
| 2022 | 26 | 18 |
| 2023 | 28 | 21 |
| 2024 | 23 | 16 |
| 2025 | 15 | 24 |
| 2026 | 13 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for reducing emissions with smart alternator18 Aug 2026US 12,709,274 B2Cummins Inc.
- Hybrid drive and fuel vaporizer for UAV and other mobile environments18 Aug 2026US 12,709,419 B2LiquidPiston, Inc.
- Engine control system for intake valve opening timing during cold start11 Aug 2026US 12,704,099 B2Cummins Power Generation Inc.
- Systems and method for vehicle thermal management28 Jul 2026US 12,692,812 B2
- Internal combustion engine7 Jul 2026US 12,674,433 B2Toyota Jidosha Kabushiki Kaisha
- System and method for generating electricity using pyrolysis of plastics8 Oct 2026US 2026/0312100 A1
- Compression ignition engine and system utilizing ammonia as a fuel source24 Sep 2026US 2026/0286881 A1Analytical Engineering, Inc.
- 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
- Method and Apparatus for Non-Fossil Fuel Internal Combustion Engine27 Aug 2026US 2026/0251112 A1MayMaan Research, LLC
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
- Pipelined memory controller180US 6,272,609 B1Micron Electronics, Inc. · 2001
- Premixed charge compression ignition engine with optimal combustion control152US 6,230,683 B1Cummins Engine Company, Inc. · 2001
- Fuel-conditioning skid147US 7,442,239 B2Ingersoll-Rand Energy Systems Corporation · 2008