F02B 25/14
Engines characterised by using fresh charge for scavenging cylinders: using reverse-flow scavenging
Official title: using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
F02B25/14 (Engines characterised by using fresh charge for scavenging cylinders: using reverse-flow scavenging) appears on 540 US grants and 367 published applications in this corpus.
Search patents in F02B- Granted patents
- 540
- Published applications
- 367
- Assignees
- 177
- Inventors
- 795
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 10 | 0 |
| 1982 | 11 | 0 |
| 1983 | 2 | 0 |
| 1984 | 8 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 9 | 0 |
| 1989 | 9 | 0 |
| 1990 | 10 | 0 |
| 1991 | 14 | 0 |
| 1992 | 11 | 0 |
| 1993 | 13 | 0 |
| 1994 | 15 | 0 |
| 1995 | 7 | 0 |
| 1996 | 9 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 11 | 0 |
| 2000 | 8 | 0 |
| 2001 | 17 | 9 |
| 2002 | 16 | 13 |
| 2003 | 19 | 17 |
| 2004 | 12 | 20 |
| 2005 | 13 | 8 |
| 2006 | 15 | 21 |
| 2007 | 18 | 15 |
| 2008 | 11 | 10 |
| 2009 | 11 | 21 |
| 2010 | 8 | 18 |
| 2011 | 11 | 23 |
| 2012 | 13 | 24 |
| 2013 | 16 | 16 |
| 2014 | 22 | 23 |
| 2015 | 13 | 14 |
| 2016 | 14 | 24 |
| 2017 | 18 | 14 |
| 2018 | 27 | 25 |
| 2019 | 19 | 14 |
| 2020 | 16 | 15 |
| 2021 | 14 | 4 |
| 2022 | 9 | 5 |
| 2023 | 7 | 7 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Carbureted engine having an adjustable fuel to air ratio14 Apr 2026US 12,601,315 B2INI Power Systems, Inc.
- Two-stroke engine with crankcase fuel injector30 Sep 2025US 12,429,020 B2
- Two-stroke engine24 Sep 2024US 12,098,669 B2Yamabiko Corporation
- Two-stroke internal combustion engine and engine working machine2 Apr 2024US 11,946,408 B2Yamabiko Corporation
- Schnuerle scavenging two-stroke engine28 Nov 2023US 11,828,221 B2Yamabiko Corporation
- Two-cycle engine with scavaging passage8 Oct 2026US 2026/0309071 A1Maruyama Mfg.Co., Inc.
- Two-stroke engine and handheld work apparatus23 Jul 2026US 2026/0210286 A1Andreas Stihl AG & CO.KG
- Carbureted engine having an adjustable fuel to air ratio16 Jul 2026US 2026/0201854 A1INI Power Systems, Inc.
- Two-stroke engine2 Apr 2026US 2026/0092553 A1Andreas Stihl AG & CO.KG
- Crankcase scavenged two-stroke engine and handheld power tool2 Apr 2026US 2026/0092554 A1Husqvarna AB
Most cited
By later US patents
- Two stroke internal combustion engine64US 6,874,453 B2innogy SE · 2005
- Combustion chamber importing system for two-cycle diesel engine54US 4,774,919 AYamaha Hatsudoki Kabushiki Kaisha · 1988
- Stratified scavenging two-cycle engine53US 6,289,856 B1Komatsu Zenoah Co. · 2001
- Exhaust timing control device for a two-cycle engine46US 4,364,346 AYamaha Hatsudoki Kabushiki Kaisha · 1982
- Two-cycle internal combustion engine43US 4,732,117 AToyota Jidosha Kabushiki Kaisha · 1988