F01L 9/12
With a liquid chamber between a piston actuated by a cam and
Official title: with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
F01L9/12 (With a liquid chamber between a piston actuated by a cam and) appears on 259 US grants and 224 published applications in this corpus.
Search patents in F01L- Granted patents
- 259
- Published applications
- 224
- Assignees
- 81
- Inventors
- 445
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 5 | 0 |
| 1992 | 10 | 0 |
| 1993 | 7 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 6 |
| 2003 | 6 | 8 |
| 2004 | 6 | 5 |
| 2005 | 4 | 3 |
| 2006 | 8 | 8 |
| 2007 | 5 | 4 |
| 2008 | 2 | 6 |
| 2009 | 6 | 15 |
| 2010 | 6 | 10 |
| 2011 | 9 | 13 |
| 2012 | 12 | 13 |
| 2013 | 7 | 12 |
| 2014 | 14 | 18 |
| 2015 | 16 | 11 |
| 2016 | 12 | 19 |
| 2017 | 9 | 14 |
| 2018 | 11 | 10 |
| 2019 | 12 | 15 |
| 2020 | 13 | 15 |
| 2021 | 12 | 6 |
| 2022 | 8 | 6 |
| 2023 | 6 | 3 |
| 2024 | 4 | 2 |
| 2025 | 2 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Variable duration valve train9 Jun 2026US 12,650,087 B1
- Internal combustion engine with optimized intake system24 Feb 2026US 12,560,108 B2Dumarey Automotive Italia S.p.A.
- Lost motion variable valve actuation systems and method13 May 2025US 12,297,757 B2Jacobs Vehicle Systems, Inc.
- Multi-cylinder internal combustion engine, with cylinders equipped with intake valve variable actuation systems having hydraulic circuits which cross each other11 Mar 2025US 12,247,502 B2C. R. F. Societa Consortile per Azioni
- Fully variable electro-hydraulic valve system22 Oct 2024US 12,123,330 B2Weifang Lichuang Electronic Technology Co., Ltd
- Internal combustion engine with optimized intake system4 Dec 2025US 2025/0369374 A1Dumarey Automotive Italia S.p.A.
- Multi-cylinder internal combustion engine, with cylinders equipped with intake valve variable actuation systems having hydraulic circuits which cross each other16 Jan 2025US 2025/0020072 A1C. R. F. Societa Consortile per Azioni
- Valve actuators for specialized stationary two-piston hydraulic engines8 Feb 2024US 2024/0044267 A1Jiangsu Jointek Precision Machinery Co., Ltd.
- Driving devices for a composite engine valve of a dedicated driving cam8 Feb 2024US 2024/0044268 A1Jiangsu Jointek Precision Machinery Co., Ltd.
- Compression release engine in-cylinder braking system9 Mar 2023US 2023/0075743 A1Weifang Lichuang Electronic Technology Co., Ltd
Most cited
By later US patents
- Internal combustion engines with combined cam and electro-hydraulic engine valve control86US 5,680,841 ADiesel Engine Retarders, Inc. · 1997
- System and method for controlling the amount of lost motion between an engine valve and a valve actuation means83US 5,829,397 ADiesel Engine Retarders, Inc. · 1998
- Multi-cylinder diesel engine with variable valve actuation74US 6,237,551 B1C. R. F. Societa Consortile per Azioni · 2001
- Device for varying a valve timing and lift for an internal combustion engine58US 4,696,265 AToyota Jidosha Kabushiki Kaisha · 1987
- Electro-rheological valve control mechanism55US 5,103,779 A1992