F02N 19/04
By heating of fluids used in engines
Official title: by heating of fluids used in engines
F02N19/04 (By heating of fluids used in engines) appears on 356 US grants and 236 published applications in this corpus.
Search patents in F02N- Granted patents
- 356
- Published applications
- 236
- Assignees
- 203
- Inventors
- 782
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 7 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 10 | 0 |
| 1981 | 4 | 0 |
| 1982 | 14 | 0 |
| 1983 | 14 | 0 |
| 1984 | 9 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 6 | 0 |
| 1989 | 7 | 0 |
| 1990 | 4 | 0 |
| 1991 | 6 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 7 | 0 |
| 1995 | 9 | 0 |
| 1996 | 9 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 13 |
| 2003 | 10 | 3 |
| 2004 | 5 | 13 |
| 2005 | 8 | 4 |
| 2006 | 6 | 12 |
| 2007 | 2 | 6 |
| 2008 | 3 | 8 |
| 2009 | 4 | 10 |
| 2010 | 5 | 7 |
| 2011 | 6 | 6 |
| 2012 | 9 | 8 |
| 2013 | 2 | 10 |
| 2014 | 7 | 14 |
| 2015 | 7 | 22 |
| 2016 | 8 | 13 |
| 2017 | 15 | 19 |
| 2018 | 15 | 18 |
| 2019 | 17 | 21 |
| 2020 | 15 | 5 |
| 2021 | 10 | 5 |
| 2022 | 10 | 6 |
| 2023 | 5 | 3 |
| 2024 | 4 | 3 |
| 2025 | 3 | 2 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and apparatus for detecting the operation of an engine-independent auxiliary heater and for diagnosing a coolant temperature of a motor vehicle4 Aug 2026US 12,697,855 B2Volkswagen Aktiengesellschaft
- Internal combustion engine7 Jul 2026US 12,674,433 B2Toyota Jidosha Kabushiki Kaisha
- Method of starting a compression ignition engine16 Dec 2025US 12,497,939 B2Caterpillar Inc.
- Precombustion chamber igniter and cold start control method for methanol engine9 Sep 2025US 12,410,743 B2Tianjin University
- Vehicle heater and controls therefor21 Jan 2025US 12,203,436 B2Dometic Marine Canada Inc.
- Efficient heating management system integrated to a diesel engine generator using heat obtained from an external heat source to economically heat the engine block coolant6 Aug 2026US 2026/0226877 A1Panoteknik Jenerator Elektrik Sanayi Ve Ticaret Limited Sirketi
- Power indicator for use with electrical cables16 Apr 2026US 2026/0106418 A1DCD Enterprises, LLC
- Systems and methods for preconditioning a work vehicle for operation2 Apr 2026US 2026/0092551 A1Deere & Company
- Process for fast start of a hydrogen generator5 Mar 2026US 2026/0063097 A1Precision Combustion, Inc.
- Internal combustion engine29 Jan 2026US 2026/0028956 A1Toyota Jidosha Kabushiki Kaisha
Most cited
By later US patents
- Hybrid electric vehicle regenerative braking energy recovery system317US 5,291,960 AFord Motor Company · 1994
- Hybird vehicle cooling system127US 5,255,733 AFord Motor Company · 1993
- Auxiliary power unit for vehicles113US 4,448,157 A1984
- System for controlling the temperature of the air in a cabin for an engine-electric motor hybrid car103US 5,497,941 ANippondenso Co., Ltd. · 1996
- Auxiliary air conditioning system for trucks and other heavy duty vehicles87US 4,825,663 APACCAR Inc · 1989