F02B 23/02
Internal-combustion piston engines: other engines characterised by special shape or construction of
Official title: with compression ignition
F02B23/02 (Internal-combustion piston engines: other engines characterised by special shape or construction of) appears on 881 US grants and 748 published applications in this corpus.
Search patents in F02B- Granted patents
- 881
- Published applications
- 748
- Assignees
- 281
- Inventors
- 1,588
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 3 | 0 |
| 1978 | 7 | 0 |
| 1979 | 7 | 0 |
| 1980 | 5 | 0 |
| 1981 | 10 | 0 |
| 1982 | 6 | 0 |
| 1983 | 7 | 0 |
| 1984 | 7 | 0 |
| 1985 | 18 | 0 |
| 1986 | 9 | 0 |
| 1987 | 20 | 0 |
| 1988 | 17 | 0 |
| 1989 | 16 | 0 |
| 1990 | 12 | 0 |
| 1991 | 11 | 0 |
| 1992 | 16 | 0 |
| 1993 | 4 | 0 |
| 1994 | 17 | 0 |
| 1995 | 5 | 0 |
| 1996 | 10 | 0 |
| 1997 | 10 | 0 |
| 1998 | 10 | 0 |
| 1999 | 8 | 0 |
| 2000 | 15 | 0 |
| 2001 | 12 | 4 |
| 2002 | 9 | 16 |
| 2003 | 31 | 29 |
| 2004 | 23 | 30 |
| 2005 | 20 | 21 |
| 2006 | 18 | 25 |
| 2007 | 20 | 22 |
| 2008 | 29 | 18 |
| 2009 | 13 | 33 |
| 2010 | 15 | 32 |
| 2011 | 22 | 33 |
| 2012 | 12 | 22 |
| 2013 | 23 | 27 |
| 2014 | 28 | 29 |
| 2015 | 18 | 47 |
| 2016 | 30 | 52 |
| 2017 | 26 | 41 |
| 2018 | 55 | 52 |
| 2019 | 45 | 56 |
| 2020 | 57 | 56 |
| 2021 | 43 | 27 |
| 2022 | 24 | 17 |
| 2023 | 17 | 25 |
| 2024 | 16 | 13 |
| 2025 | 13 | 12 |
| 2026 | 5 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Piston with combustion stabilizing bowl4 Aug 2026US 12,698,734 B2Caterpillar Inc.
- Port assembly for 2-stroke diesel engine9 Jun 2026US 12,650,106 B2DeltaHawk Engines, Inc.
- Stratified nitrogen enriched air (NEA) strategies and methods to reduce NOx emissions from engines12 May 2026US 12,624,654 B2Saudi Arabian Oil Company
- Internal combustion engine system10 Feb 2026US 12,546,263 B2Volvo Truck Corporation
- Engine system, piston, and operating method for pseudo-tumble mixing of hydrogen fuel and air6 Jan 2026US 12,516,648 B2Caterpillar Inc.
- Engine system employing air jet injection for limiting plume-plume interaction of combusting fuel spray plumes10 Sep 2026US 2026/0266212 A1Caterpillar Inc.
- Ducted fuel injection strategy employing baffle for redirection of combusting fuel plumes10 Sep 2026US 2026/0266213 A1Caterpillar Inc.
- Piston Bowl For An Internal Combustion Engine20 Aug 2026US 2026/0243215 A1Perkins Engines Company Limited
- Wall-guided spark assistance for cold operations in gasoline compression ignition engines16 Jul 2026US 2026/0201828 A1Aramco Services Company
- Gaseous fuel combustion system and method utilizing a piston reentrant feature for hastened fuel-air mixing16 Jul 2026US 2026/0201829 A1Caterpillar Inc.
Most cited
By later US patents
- Multiple operating mode engine and method of operation134US 6,561,157 B2Cummins Inc. · 2003
- Hybrid electric vehicle127US 5,881,559 AIsuzu Ceramics Research Institute Co., Ltd. · 1999
- Combustion system for direct injection diesel engines95US 6,553,960 B1Yanmar Co., Ltd. · 2003
- Method and apparatus for dual fuel injection into an internal combustion engine93US 6,202,601 B1Westport Research Inc. · 2001
- Apparatus and method for controlling homogeneous charge compression ignition combustion in diesel engines91US 5,832,880 ASouthwest Research Institute · 1998