F01B 3/045
By two or more curved surfaces
Official title: {by two or more curved surfaces, e.g. for two or more pistons in one cylinder}
F01B3/045 (By two or more curved surfaces) appears on 56 US grants and 26 published applications in this corpus.
Search patents in F01B- Granted patents
- 56
- Published applications
- 26
- Assignees
- 11
- Inventors
- 58
- Latest grant
- 2 Aug 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 2 |
| 2003 | 3 | 3 |
| 2004 | 2 | 3 |
| 2005 | 1 | 1 |
| 2006 | 3 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 2 | 0 |
| 2016 | 1 | 2 |
| 2017 | 0 | 3 |
| 2018 | 1 | 0 |
| 2019 | 3 | 3 |
| 2020 | 2 | 1 |
| 2021 | 2 | 2 |
| 2022 | 2 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Opposed piston engine2 Aug 2022US 11,401,812 B2Hts LLC
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- Opposed piston engine16 Mar 2021US 10,947,846 B2Hts LLC
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- Multi-stage system16 Apr 2026US 2026/0103985 A1Kn Gg IP Holding and Licensing, LLC
- Opposed piston engine27 Jan 2022US 2022/0025767 A1Hts LLC
- Gas or fluid driven mechanical stepper motor2 Sep 2021US 2021/0270135 A1Eindhoven Medical Robotics B.V.
- Hybrid engine22 Apr 2021US 2021/0115846 A1Hts LLC
- Opposed piston engine7 May 2020US 2020/0141312 A1Hts LLC
Most cited
By later US patents
- Apparatus and method for a balanced internal combustion engine coupled to a drive shaft59US 4,834,033 A1989
- Internal combustion engine and operating cycle therefor47US 4,635,590 A1987
- Two plus two stroke opposed piston heat engine46US 4,996,953 A1991
- Multiple cylinder sinusoidal engine39US 4,090,478 A1978
- Adiabatic, two-stroke cycle engine having piston-phasing and compression ratio control system36US 5,507,253 A1996