F02B 23/0678
Unconventional, complex or non-rotationally symmetrical shapes of the combustion space
Official title: {Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets}
F02B23/0678 (Unconventional, complex or non-rotationally symmetrical shapes of the combustion space) appears on 178 US grants and 176 published applications in this corpus.
Search patents in F02B- Granted patents
- 178
- Published applications
- 176
- Assignees
- 93
- Inventors
- 430
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 2 |
| 2004 | 2 | 3 |
| 2005 | 2 | 4 |
| 2006 | 3 | 2 |
| 2007 | 3 | 1 |
| 2008 | 1 | 1 |
| 2009 | 2 | 7 |
| 2010 | 1 | 9 |
| 2011 | 4 | 7 |
| 2012 | 4 | 7 |
| 2013 | 8 | 9 |
| 2014 | 9 | 10 |
| 2015 | 5 | 11 |
| 2016 | 11 | 13 |
| 2017 | 4 | 10 |
| 2018 | 14 | 8 |
| 2019 | 12 | 15 |
| 2020 | 20 | 27 |
| 2021 | 8 | 7 |
| 2022 | 8 | 5 |
| 2023 | 3 | 7 |
| 2024 | 4 | 3 |
| 2025 | 5 | 4 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Stratified nitrogen enriched air (NEA) strategies and methods to reduce NOx emissions from engines12 May 2026US 12,624,654 B2Saudi Arabian Oil Company
- Systems, apparatus, and methods for inducing enhanced radical ignition in internal combustion engines using a radical chemicals generator25 Nov 2025US 12,480,435 B2Radical Combustion Technologies, LLC
- Piston and an internal combustion engine system14 Oct 2025US 12,442,347 B2Volvo Truck Corporation
- Piston assembly with opposing injection regions for an opposed-piston engine3 Jun 2025US 12,320,312 B2Achates Power, Inc.
- Low compression natural gas engine piston bowl for improved combustion stability1 Apr 2025US 12,264,636 B2Caterpillar Inc.
- Piston Bowl For An Internal Combustion Engine20 Aug 2026US 2026/0243215 A1Perkins Engines Company Limited
- Gaseous fuel combustion system and method utilizing a piston reentrant feature for hastened fuel-air mixing16 Jul 2026US 2026/0201829 A1Caterpillar Inc.
- Piston for reciprocating within a cylinder in an internal combustion engine18 Jun 2026US 2026/0168460 A1Cummins Inc.
- Systems, apparatus, and methods for inducing enhanced radical ignition in internal combustion engines using a radical chemicals generator7 May 2026US 2026/0126001 A1Radical Combustion Technologies, LLC
- Piston for an internal combustion engine11 Dec 2025US 2025/0376962 A1Volvo Truck Corporation
Most cited
By later US patents
- Intensifier-injector for gaseous fuel for positive displacement engines67US 5,315,973 AThe University of British Columbia · 1994
- Internal combustion engine with delayed torch ignition of oil fuel charge62US 4,091,772 ACooper Industries, Inc. · 1978
- Intensifier-injector for gaseous fuel for positive displacement engines39US 5,067,467 AThe University of British Columbia · 1991
- Open chamber diesel engine having a piston with recesses therein33US 5,285,755 AChrysler Corporation · 1994
- Internal-combustion engine with predominantly swirl-free air inflow into a shallow combustion space31US 5,215,052 AMercedes-Benz AG · 1993