F02B 23/00
Internal-combustion piston engines: other engines characterised by special shape or construction of
Official title: Other engines characterised by special shape or construction of combustion chambers to improve operation (engines with incandescent chambers F02B9/08)
F02B23/00 (Internal-combustion piston engines: other engines characterised by special shape or construction of) appears on 2,215 US grants and 1,684 published applications in this corpus.
Search patents in F02B- Granted patents
- 2,215
- Published applications
- 1,684
- Assignees
- 506
- Inventors
- 3,511
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 8 | 0 |
| 1978 | 21 | 0 |
| 1979 | 14 | 0 |
| 1980 | 16 | 0 |
| 1981 | 24 | 0 |
| 1982 | 24 | 0 |
| 1983 | 14 | 0 |
| 1984 | 19 | 0 |
| 1985 | 34 | 0 |
| 1986 | 14 | 0 |
| 1987 | 32 | 0 |
| 1988 | 37 | 0 |
| 1989 | 23 | 0 |
| 1990 | 26 | 0 |
| 1991 | 22 | 0 |
| 1992 | 31 | 0 |
| 1993 | 26 | 0 |
| 1994 | 33 | 0 |
| 1995 | 15 | 0 |
| 1996 | 21 | 0 |
| 1997 | 28 | 0 |
| 1998 | 50 | 0 |
| 1999 | 57 | 0 |
| 2000 | 75 | 0 |
| 2001 | 63 | 22 |
| 2002 | 66 | 82 |
| 2003 | 102 | 78 |
| 2004 | 77 | 87 |
| 2005 | 69 | 63 |
| 2006 | 64 | 75 |
| 2007 | 60 | 76 |
| 2008 | 76 | 61 |
| 2009 | 35 | 97 |
| 2010 | 59 | 65 |
| 2011 | 52 | 61 |
| 2012 | 42 | 58 |
| 2013 | 53 | 58 |
| 2014 | 52 | 70 |
| 2015 | 49 | 88 |
| 2016 | 60 | 94 |
| 2017 | 64 | 77 |
| 2018 | 89 | 85 |
| 2019 | 78 | 101 |
| 2020 | 99 | 89 |
| 2021 | 80 | 58 |
| 2022 | 52 | 31 |
| 2023 | 38 | 44 |
| 2024 | 31 | 26 |
| 2025 | 22 | 23 |
| 2026 | 7 | 15 |
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
- Spray guided stratification for fueling a passive pre-chamber3 Mar 2026US 12,565,849 B2Saudi Arabian Oil Company
- Engine having hotspot fuel igniter and piston and methodology using same3 Mar 2026US 12,565,865 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
- Engine13 Aug 2026US 2026/0235068 A1Ishikawa Energy Research Co., Ltd.
- Engine and operating strategy augmenting tumble flow to increase fuel-air mixing30 Jul 2026US 2026/0218671 A1Caterpillar Inc.
Most cited
By later US patents
- System and method for engine starting160US 7,159,568 B1Ford Global Technologies, LLC · 2007
- Multiple operating mode engine and method of operation134US 6,561,157 B2Cummins Inc. · 2003
- Optimized fuel management system for direct injection ethanol enhancement of gasoline engines129US 7,225,787 B2Massachusetts Institute of Technology · 2007
- Hybrid electric vehicle127US 5,881,559 AIsuzu Ceramics Research Institute Co., Ltd. · 1999
- Plasma jet ignition engine and method122US 4,203,393 AFord Motor Company · 1980