F02B 75/28
Engines with two or more pistons reciprocating within same cylinder or within
Official title: Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (arranged oppositely relative to main shaft F02B75/24)
F02B75/28 (Engines with two or more pistons reciprocating within same cylinder or within) appears on 600 US grants and 552 published applications in this corpus.
Search patents in F02B- Granted patents
- 600
- Published applications
- 552
- Assignees
- 145
- Inventors
- 594
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 8 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 8 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 9 | 0 |
| 1990 | 3 | 0 |
| 1991 | 10 | 0 |
| 1992 | 7 | 0 |
| 1993 | 8 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 8 | 0 |
| 2001 | 13 | 1 |
| 2002 | 3 | 5 |
| 2003 | 7 | 11 |
| 2004 | 5 | 10 |
| 2005 | 9 | 6 |
| 2006 | 6 | 12 |
| 2007 | 13 | 12 |
| 2008 | 10 | 18 |
| 2009 | 10 | 21 |
| 2010 | 7 | 26 |
| 2011 | 6 | 18 |
| 2012 | 14 | 44 |
| 2013 | 25 | 32 |
| 2014 | 35 | 33 |
| 2015 | 29 | 25 |
| 2016 | 28 | 45 |
| 2017 | 34 | 39 |
| 2018 | 40 | 25 |
| 2019 | 37 | 42 |
| 2020 | 34 | 40 |
| 2021 | 34 | 26 |
| 2022 | 25 | 14 |
| 2023 | 17 | 20 |
| 2024 | 15 | 10 |
| 2025 | 17 | 6 |
| 2026 | 5 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Multi-part piston construction for an opposed-piston engine29 Sep 2026US 12,747,713 B2General Atomics Aeronautical Systems, Inc.
- Double crankshaft reciprocating engine11 Aug 2026US 12,704,089 B2
- Dual piston based gensets for vehicle electrification16 Jun 2026US 12,655,787 B2ePower Mobility LLC
- Internal combustion engine19 May 2026US 12,631,138 B2Carnot, S.A.
- Optimal efficiency internal combustion engine7 Apr 2026US 12,595,758 B2Creed Engines, LLC
- Two stroke apposed pistons parallel cylinders internal combustion engine1 Oct 2026US 2026/0298132 A1
- Engine13 Aug 2026US 2026/0235053 A1Ishikawa Energy Research Co., Ltd.
- Engine13 Aug 2026US 2026/0235068 A1Ishikawa Energy Research Co., Ltd.
- Hydrogen internal combustion engine with injection ring25 Jun 2026US 2026/0177023 A1Ferrari S.P. A.
- Opposed-piston engine26 Mar 2026US 2026/0085630 A1Kubota Corporation
Most cited
By later US patents
- Internal combustion engine with compound air compression138US 5,362,219 A1994
- Cylinder and piston assemblies for opposed piston engines88US 7,861,679 B2Achates Power, Inc. · 2011
- Opposed-piston, opposed-cylinder engine with collinear cylinders71US 8,763,583 B2EcoMotors, Inc. · 2014
- Master and slave pullrods70US 9,593,710 B2EcoMotors, Inc. · 2017
- Variable-cycle reciprocating internal combustion engine64US 4,856,463 A1989