F02B 25/20
Means for reducing the mixing of charge and combustion residues or for
Official title: Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
F02B25/20 (Means for reducing the mixing of charge and combustion residues or for) appears on 306 US grants and 249 published applications in this corpus.
Search patents in F02B- Granted patents
- 306
- Published applications
- 249
- Assignees
- 87
- Inventors
- 421
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 9 | 0 |
| 2001 | 13 | 9 |
| 2002 | 14 | 14 |
| 2003 | 23 | 19 |
| 2004 | 7 | 19 |
| 2005 | 22 | 15 |
| 2006 | 18 | 24 |
| 2007 | 11 | 15 |
| 2008 | 14 | 14 |
| 2009 | 14 | 18 |
| 2010 | 10 | 6 |
| 2011 | 8 | 10 |
| 2012 | 9 | 13 |
| 2013 | 9 | 9 |
| 2014 | 12 | 10 |
| 2015 | 6 | 9 |
| 2016 | 6 | 11 |
| 2017 | 9 | 7 |
| 2018 | 14 | 4 |
| 2019 | 7 | 5 |
| 2020 | 4 | 2 |
| 2021 | 3 | 4 |
| 2022 | 3 | 6 |
| 2023 | 5 | 3 |
| 2024 | 2 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fueling time based on engine speed and temperature19 May 2026US 12,631,152 B2Yamabiko Corporation
- Air-leading type stratified scavenging two-stroke internal combustion engine, and engine working machine27 Feb 2024US 11,913,371 B2Yamabiko Corporation
- Two-stroke engine, and handheld power tool23 Jan 2024US 11,879,381 B2Husqvarna AB
- Method in a two-stroke engine and two-stroke engine28 Nov 2023US 11,828,238 B2Hedman Ericsson Patent AB
- Engine piston, engine, hand-held tool, and method of manufacturing an engine piston15 Aug 2023US 11,725,570 B2Husqvarna AB
- Two-stroke engine and handheld work apparatus23 Jul 2026US 2026/0210286 A1Andreas Stihl AG & CO.KG
- A fuel injection arrangement for hand-held powertools23 Oct 2025US 2025/0327433 A1Husqvarna AB
- Engine control device and engine control method7 Nov 2024US 2024/0369027 A1Yamabiko Corporation
- Rotary type carburetor for stratefied scavenging engine14 Sep 2023US 2023/0287849 A1Zama Japan Kabushiki Kaisha
- Two-cycle engine2 Feb 2023US 2023/0036494 A1Yamabiko Corporation
Most cited
By later US patents
- Stratified-charge two-stroke internal combustion engines42US 4,253,433 AThe Queen's University of Belfast · 1981
- Two-cycle engine with pure air scavenging39US 4,248,185 A1981
- Stratified scavenging two-cycle engine39US 6,216,650 B1Komatsu Zenoah Co. · 2001
- Continuously variable volume scavenging passage for two-stroke engines37US 5,379,732 A1995
- Stratified scavenging two-cycle engine33US 6,112,708 AKomatsu Zenoah Co. · 2000