F02B 55/16
Admission or exhaust passages in pistons or outer members
F02B55/16 (Admission or exhaust passages in pistons or outer members) appears on 57 US grants and 52 published applications in this corpus.
Search patents in F02B- Granted patents
- 57
- Published applications
- 52
- Assignees
- 21
- Inventors
- 92
- Latest grant
- 7 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 5 |
| 2012 | 0 | 0 |
| 2013 | 0 | 3 |
| 2014 | 6 | 3 |
| 2015 | 2 | 5 |
| 2016 | 2 | 2 |
| 2017 | 3 | 3 |
| 2018 | 5 | 5 |
| 2019 | 1 | 1 |
| 2020 | 6 | 5 |
| 2021 | 3 | 5 |
| 2022 | 5 | 5 |
| 2023 | 4 | 1 |
| 2024 | 3 | 1 |
| 2025 | 1 | 3 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotational engine with inner and outer rings7 Oct 2025US 12,435,632 B2Duplicent, LLC
- Rotary drive apparatus3 Dec 2024US 12,158,102 B2
- Gas-powered internal combustion engine22 Oct 2024US 12,123,340 B1
- Rotational engine with inner and outer rings24 Sep 2024US 12,098,641 B2Duplicent, LLC
- Rotary turbine combustion engine1 Aug 2023US 11,713,678 B2
- Rotational Engine With Inner and Outer Rings17 Sep 2026US 2026/0275867 A1Duplicent, LLC
- Rotary Vane Internal Combustion Engine17 Sep 2026US 2026/0275869 A1
- Egr system for rotary engine13 Aug 2026US 2026/0235067 A1Mazda Motor Corporation
- Rotational engine18 Sep 2025US 2025/0290419 A1Duplicent, LLC
- Rotational engine with inner and outer rings31 Jul 2025US 2025/0243759 A1Duplicent, LLC
Most cited
By later US patents
- Rotary engine22US 5,372,107 A1994
- Rotary piston engine exhaust gas recycling means12US 4,084,549 AToyo Kogyo Co., Ltd. · 1978
- Intake system for internal combustion engine12US 4,756,284 AMazda Motor Corporation · 1988
- Rotary power unit8US 3,967,594 A1976
- Rotary internal combustion engine8US 4,633,829 A1987