F02B 25/00
Engines characterised by using fresh charge for scavenging cylinders
F02B25/00 (Engines characterised by using fresh charge for scavenging cylinders) appears on 1,122 US grants and 811 published applications in this corpus.
Search patents in F02B- Granted patents
- 1,122
- Published applications
- 811
- Assignees
- 295
- Inventors
- 1,447
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 9 | 0 |
| 1978 | 11 | 0 |
| 1979 | 6 | 0 |
| 1980 | 13 | 0 |
| 1981 | 22 | 0 |
| 1982 | 18 | 0 |
| 1983 | 5 | 0 |
| 1984 | 13 | 0 |
| 1985 | 6 | 0 |
| 1986 | 9 | 0 |
| 1987 | 11 | 0 |
| 1988 | 14 | 0 |
| 1989 | 24 | 0 |
| 1990 | 20 | 0 |
| 1991 | 35 | 0 |
| 1992 | 27 | 0 |
| 1993 | 20 | 0 |
| 1994 | 18 | 0 |
| 1995 | 11 | 0 |
| 1996 | 14 | 0 |
| 1997 | 14 | 0 |
| 1998 | 19 | 0 |
| 1999 | 18 | 0 |
| 2000 | 20 | 0 |
| 2001 | 32 | 14 |
| 2002 | 25 | 23 |
| 2003 | 35 | 31 |
| 2004 | 23 | 30 |
| 2005 | 34 | 24 |
| 2006 | 24 | 37 |
| 2007 | 24 | 28 |
| 2008 | 24 | 30 |
| 2009 | 27 | 38 |
| 2010 | 16 | 30 |
| 2011 | 21 | 45 |
| 2012 | 22 | 51 |
| 2013 | 35 | 40 |
| 2014 | 40 | 48 |
| 2015 | 38 | 52 |
| 2016 | 39 | 67 |
| 2017 | 45 | 41 |
| 2018 | 62 | 39 |
| 2019 | 42 | 31 |
| 2020 | 28 | 33 |
| 2021 | 33 | 19 |
| 2022 | 25 | 14 |
| 2023 | 14 | 21 |
| 2024 | 17 | 9 |
| 2025 | 7 | 8 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F02B 25/14Engines characterised by using fresh charge for scavenging cylinders: using reverse-flow scavenging540
- F02B 25/02Engines characterised by using fresh charge for scavenging cylinders: using unidirectional scavenging392
- F02B 25/20Means for reducing the mixing of charge and combustion residues or for306
- F02B 25/26Multi-cylinder engines other than those provided for in, or of interest apart65
Recent patents
- Valve system for two-stroke engine4 Aug 2026US 12,698,744 B2GM Global Technology Operations LLC
- Intake over intake engine21 Jul 2026US 12,687,135 B1
- Port assembly for 2-stroke diesel engine9 Jun 2026US 12,650,106 B2DeltaHawk Engines, Inc.
- Fueling time based on engine speed and temperature19 May 2026US 12,631,152 B2Yamabiko Corporation
- Carbureted engine having an adjustable fuel to air ratio14 Apr 2026US 12,601,315 B2INI Power Systems, Inc.
- Two-cycle engine with scavaging passage8 Oct 2026US 2026/0309071 A1Maruyama Mfg.Co., Inc.
- Two stroke apposed pistons parallel cylinders internal combustion engine1 Oct 2026US 2026/0298132 A1
- Internal combustion engine20 Aug 2026US 2026/0243195 A1
- Internal combustion engine20 Aug 2026US 2026/0243196 A1
- Two-stroke engine and handheld work apparatus23 Jul 2026US 2026/0210286 A1Andreas Stihl AG & CO.KG
Most cited
By later US patents
- Internal combustion engine with a single crankshaft and having opposed cylinders with opposed pistons130US 6,170,443 B22001
- Internal combustion engine with an exhaust gas recirculation system118US 5,740,786 AMercedes-Benz AG · 1998
- Two stroke internal combustion engine64US 6,874,453 B2innogy SE · 2005
- Dual fuel engine60US 4,527,516 APro-Staff Overload Enterprises Limited · 1985
- Two-stroke diesel engine55US 6,182,619 B2General Atomics Aeronautical Systems, Inc. · 2001