F02B 55/02
Pistons
F02B55/02 (Pistons) appears on 162 US grants and 160 published applications in this corpus.
Search patents in F02B- Granted patents
- 162
- Published applications
- 160
- Assignees
- 67
- Inventors
- 240
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 3 |
| 2005 | 3 | 3 |
| 2006 | 1 | 2 |
| 2007 | 0 | 0 |
| 2008 | 2 | 3 |
| 2009 | 2 | 2 |
| 2010 | 0 | 2 |
| 2011 | 1 | 6 |
| 2012 | 2 | 5 |
| 2013 | 7 | 6 |
| 2014 | 3 | 6 |
| 2015 | 3 | 9 |
| 2016 | 6 | 13 |
| 2017 | 9 | 10 |
| 2018 | 6 | 11 |
| 2019 | 6 | 5 |
| 2020 | 13 | 17 |
| 2021 | 18 | 11 |
| 2022 | 12 | 12 |
| 2023 | 14 | 11 |
| 2024 | 14 | 6 |
| 2025 | 5 | 10 |
| 2026 | 3 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rotary machine5 May 2026US 12,618,328 B2Lumenium LLC
- Rotary piston machine3 Feb 2026US 12,540,572 B2
- Rotary combustion engine with integrated multistage fuel system6 Jan 2026US 12,516,623 B2
- Combined sealing piece, volumetric machine and wide fuel engine18 Nov 2025US 12,473,872 B2
- Rotational engine with inner and outer rings7 Oct 2025US 12,435,632 B2Duplicent, LLC
- Rotational Engine With Inner and Outer Rings17 Sep 2026US 2026/0275867 A1Duplicent, LLC
- Rotary machine17 Sep 2026US 2026/0275868 A1Lumenium LLC
- Rotary Vane Internal Combustion Engine17 Sep 2026US 2026/0275869 A1
- High-Efficiency Rotary Engine with Perpendicular Force Transmission and Compound Energy Recovery System17 Sep 2026US 2026/0275904 A1
- Rotary engine with internal arc-sector actuation27 Aug 2026US 2026/0251090 A1
Most cited
By later US patents
- Rotary positive displacement device134US 5,431,551 A1995
- Quasiturbine (Qurbine) rotor with central annular support and ventilation24US 6,899,075 B22005
- Rotor engine21US 5,251,595 AShenzhen Aote Electrical Appliances Co. Ltd. · 1993
- Compound engine system with rotary engine21US 9,027,345 B2Pratt & Whitney Canada Corp. · 2015
- Combustion control via homogeneous combustion radical ignition (HCRI) or partial HCRI in cyclic IC engines20US 9,638,093 B2HCRI Technologies International, LLC · 2017