F02F 1/4221
Particularly for three or more inlet valves
Official title: {particularly for three or more inlet valves}
F02F1/4221 (Particularly for three or more inlet valves) appears on 113 US grants and 9 published applications in this corpus.
Search patents in F02F- Granted patents
- 113
- Published applications
- 9
- Assignees
- 23
- Inventors
- 108
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 15 | 0 |
| 1993 | 8 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 7 | 0 |
| 1997 | 9 | 0 |
| 1998 | 13 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 3 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Internal combustion engine with spark plug and prechamber spark plug12 Aug 2025US 12,385,446 B2Robert Bosch GmbH
- Control device for internal combustion engine23 Oct 2018US 10,107,147 B2Toyota Jidosha Kabushiki Kaisha
- Internal combustion engine with five valves per cylinder13 May 2008US 7,370,618 B2
- Composite lightweight valve for internal combustion engines29 Apr 2003US 6,553,956 B2DaimlerChrysler AG
- Induction system for engine28 Jan 2003US 6,510,837 B1Yamaha Hatsudoki Kabushiki Kaisha
- Internal Combustion Engine with Spark Plug and Prechamber Spark Plug11 Jul 2024US 2024/0229734 A9Robert Bosch GmbH
- Internal Combustion Engine with Spark Plug and Prechamber Spark Plug25 Apr 2024US 2024/0133350 A1Robert Bosch GmbH
- Control device for internal combustion engine11 Jan 2018US 2018/0010486 A1Toyota Jidosha Kabushiki Kaisha
- Internal combustion engine with five valves per cylinder9 Aug 2007US 2007/0181093 A1
- Internal combustion engine with three valves per cylinder9 Aug 2007US 2007/0181098 A1
Most cited
By later US patents
- Direct fuel injection stratified charge engine63US 5,605,125 A1997
- Direct fuel injection stratified charge engine53US 5,746,171 A1998
- Fuel injection type internal combustion engine37US 4,667,636 AToyota Jidosha Kabushiki Kaisha · 1987
- Cylinder head cooling arrangement35US 5,094,193 AYamaha Hatsudoki Kabushiki Kaisha · 1992
- Induction control system for multi-valve engine29US 5,852,994 AYamaha Hatsudoki Kabushiki Kaisha · 1998