F01L 1/462
Valve return spring arrangements
Official title: {Valve return spring arrangements}
F01L1/462 (Valve return spring arrangements) appears on 283 US grants and 248 published applications in this corpus.
Search patents in F01L- Granted patents
- 283
- Published applications
- 248
- Assignees
- 137
- Inventors
- 554
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 4 |
| 2002 | 5 | 5 |
| 2003 | 4 | 8 |
| 2004 | 11 | 6 |
| 2005 | 4 | 6 |
| 2006 | 7 | 7 |
| 2007 | 4 | 7 |
| 2008 | 8 | 16 |
| 2009 | 6 | 14 |
| 2010 | 7 | 15 |
| 2011 | 10 | 6 |
| 2012 | 10 | 10 |
| 2013 | 11 | 6 |
| 2014 | 5 | 6 |
| 2015 | 10 | 12 |
| 2016 | 10 | 12 |
| 2017 | 7 | 19 |
| 2018 | 15 | 19 |
| 2019 | 18 | 9 |
| 2020 | 18 | 8 |
| 2021 | 15 | 24 |
| 2022 | 15 | 12 |
| 2023 | 8 | 8 |
| 2024 | 6 | 2 |
| 2025 | 5 | 3 |
| 2026 | 2 | 4 |
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
- Engine valve control system and method24 Mar 2026US 12,584,425 B1
- Oil circuit and spool valve for selective control of variable valve lift systems11 Nov 2025US 12,467,390 B2Eaton Intelligent Power Limited
- Switching rocker arm having stamped inner arm configuration2 Sep 2025US 12,404,785 B2Eaton Intelligent Power Limited
- Twisted valve spring2 Sep 2025US 12,404,786 B2Honda Motor Co., Ltd.
- Engine braking device with returning and limiting functions and engine30 Jul 2026US 2026/0218633 A1Zhejiang Liming Intelligent Manufacturing Co., Ltd.
- Valve guide for guiding a valve stem11 Jun 2026US 2026/0160190 A1
- Apparatus comprising a plurality of tools each having at least one hydraulic chamber for hydraulic liquid29 Jan 2026US 2026/0028923 A1Freevalve AB
- Engine1 Jan 2026US 2026/0002454 A1Kubota Corporation
- Oil Circuit and Spool Valve for Selective Control of Variable Valve Lift Systems20 Mar 2025US 2025/0092805 A1Eaton Intelligent Power Limited
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
- Potential-magnetic energy driven valve mechanism48US 4,883,025 AMagnavox Government and Industrial Electronics Company · 1989
- Internal combustion engines with combined cam and electro-hydraulic engine valve control44US 5,839,453 ADiesel Engine Retarders, Inc. · 1998
- Low energy hydraulic actuator43US 5,022,358 ANorth American Philips Corporation · 1991