F01L 7/12
Rotary or oscillatory slide valve-gear or valve arrangements: specially for two-stroke engines
Official title: specially for two-stroke engines (F01L7/04 takes precedence)
F01L7/12 (Rotary or oscillatory slide valve-gear or valve arrangements: specially for two-stroke engines) appears on 56 US grants and 36 published applications in this corpus.
Search patents in F01L- Granted patents
- 56
- Published applications
- 36
- Assignees
- 24
- Inventors
- 91
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 4 |
| 2005 | 3 | 1 |
| 2006 | 2 | 3 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 2 |
| 2014 | 1 | 2 |
| 2015 | 2 | 1 |
| 2016 | 3 | 4 |
| 2017 | 2 | 1 |
| 2018 | 1 | 2 |
| 2019 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 1 |
| 2022 | 2 | 2 |
| 2023 | 3 | 3 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Multi-port exhaust valve17 Feb 2026US 12,553,402 B2Arctic Cat Inc.
- Engine and method of operating the same30 Sep 2025US 12,429,003 B2Alpha-Otto Technologies Inc.
- Engine and method of operating the same10 Dec 2024US 12,163,480 B2Alpha-Otto Technologies Inc.
- Exhaust valve assembly for a two-stroke internal combustion engine6 Feb 2024US 11,891,930 B2Brp-Rotax GmbH & Co. KG
- Two-stroke internal combustion engine28 Nov 2023US 11,828,208 B2
- Engine and method of operating the same1 Jan 2026US 2026/0002480 A1Alpha-Otto Technologies Inc.
- Engine and method of operating the same27 Mar 2025US 2025/0101925 A1Alpha-Otto Technologies Inc.
- Engine and method of operating the same15 Feb 2024US 2024/0052793 A1Alpha-Otto Technologies Inc.
- Multi-port exhaust valve9 Nov 2023US 2023/0359403 A1Arctic Cat Inc.
- Multi-port exhaust valve for two-stroke engines17 Aug 2023US 2023/0258110 A1Arctic Cat Inc.
Most cited
By later US patents
- Adjustable rotary valve assembly for a combustion engine43US 5,257,601 A1993
- Exhaust port control valve for two stroke engine38US 5,000,131 AYamaha Hatsudoki Kabushiki Kaisha · 1991
- Two-cycle engine36US 4,995,354 AFuji Jukogyo Kabushiki Kaisha · 1991
- Two cycle engine32US 4,541,371 ASuzuki Motor Corporation · 1985
- Performance improvement design for two-stroke engines27US 5,425,346 A1995