F02B 25/04
Engines having ports both in cylinder head and in cylinder wall near
Official title: Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
F02B25/04 (Engines having ports both in cylinder head and in cylinder wall near) appears on 172 US grants and 140 published applications in this corpus.
Search patents in F02B- Granted patents
- 172
- Published applications
- 140
- Assignees
- 67
- Inventors
- 256
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 12 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 2 |
| 2002 | 3 | 1 |
| 2003 | 3 | 4 |
| 2004 | 4 | 4 |
| 2005 | 7 | 5 |
| 2006 | 2 | 3 |
| 2007 | 1 | 2 |
| 2008 | 1 | 3 |
| 2009 | 1 | 2 |
| 2010 | 2 | 5 |
| 2011 | 4 | 8 |
| 2012 | 3 | 9 |
| 2013 | 6 | 8 |
| 2014 | 4 | 14 |
| 2015 | 9 | 19 |
| 2016 | 9 | 10 |
| 2017 | 12 | 8 |
| 2018 | 7 | 5 |
| 2019 | 7 | 3 |
| 2020 | 2 | 7 |
| 2021 | 8 | 6 |
| 2022 | 6 | 1 |
| 2023 | 3 | 4 |
| 2024 | 4 | 2 |
| 2025 | 0 | 5 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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.
- Exhaust gas treatment apparatus, engine system, and exhaust gas treatment method22 Oct 2024US 12,123,335 B2Hitachi Zosen Corporation
- Method for a combustion machine with two times three strokes22 Oct 2024US 12,123,342 B2Dr. Ing. h,c.F. Porsche Aktiengesellschaft
- Two-stroke engine and method for operating a two-stroke engine7 May 2024US 11,976,587 B2Andreas Stihl AG & CO.KG
- Operating Modes for Two-Cycle Uniflow-Scavenged Diesel Engine21 Aug 2025US 2025/0264068 A1
- Port Assembly for 2-Stroke Diesel Engine17 Apr 2025US 2025/0122852 A1DeltaHawk Engines, Inc.
- Work apparatus with internal combustion engine27 Feb 2025US 2025/0065485 A1Andreas Stihl AG & CO.KG
- Internal combustion engine system27 Feb 2025US 2025/0067207 A1Volvo Truck Corporation
- Internal combustion engine system27 Feb 2025US 2025/0067226 A1Volvo Truck Corporation
Most cited
By later US patents
- Internal combustion engine with an exhaust gas recirculation system118US 5,740,786 AMercedes-Benz AG · 1998
- Dual fuel engine60US 4,527,516 APro-Staff Overload Enterprises Limited · 1985
- Variable-cycle engine42US 5,022,353 AIsuzu Ceramics Research Institute Co., Ltd. · 1991
- Stratified air scavenging in two-stroke engine35US 4,995,349 AWalbro Corporation · 1991
- Combustion chamber configurations for two cycle engines31US 4,872,433 A1989