F01L 2009/2134
Helical springs
Official title: {Helical springs}
F01L2009/2134 (Helical springs) appears on 88 US grants and 83 published applications in this corpus.
Search patents in F01L- Granted patents
- 88
- Published applications
- 83
- Assignees
- 35
- Inventors
- 172
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 1 |
| 2002 | 2 | 4 |
| 2003 | 2 | 5 |
| 2004 | 6 | 11 |
| 2005 | 6 | 19 |
| 2006 | 21 | 11 |
| 2007 | 9 | 7 |
| 2008 | 8 | 6 |
| 2009 | 8 | 3 |
| 2010 | 5 | 2 |
| 2011 | 2 | 0 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 0 | 1 |
| 2020 | 2 | 1 |
| 2021 | 1 | 5 |
| 2022 | 4 | 1 |
| 2023 | 1 | 2 |
| 2024 | 0 | 0 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Fast-acting toggling armature uses centring spring9 Dec 2025US 12,494,312 B2Cheesecake Energy Ltd.
- Electro-hydrostatic actuator20 May 2025US 12,305,671 B2G. W. Lisk Company, Inc.
- Electromagnetic actuator16 May 2023US 11,649,743 B2Msg Mechatronic Systems GmbH
- Electromagnetic soft actuators20 Sep 2022US 11,448,103 B2Board of Regents, The University of Texas System
- Method and device for electrically controlling a valve actuator in an internal combustion engine22 Feb 2022US 11,255,228 B2Hedman Ericsson Patent AB
- Electro-hydrostatic actuator4 Sep 2025US 2025/0277496 A1G. W. Lisk Company, Inc.
- Electro-hydrostatic actuator7 Dec 2023US 2023/0392616 A1G. W. Lisk Company, Inc.
- Fast-Acting Toggling Armature Uses Centring Spring11 May 2023US 2023/0141997 A1Cheesecake Energy Ltd.
- Electromagnetic actuator17 Mar 2022US 2022/0082036 A1Msg Mechatronic Systems GmbH
- Method and device for electrically controlling a valve actuator in an internal combustion engine18 Nov 2021US 2021/0355848 A1Hedman Ericsson Patent AB
Most cited
By later US patents
- Variable lift operation of bistable electromechanical poppet valve actuator104US 4,829,947 AGeneral Motors Corporation · 1989
- Method and apparatus for controlling the cylinder torque of a combustion engine having electromagnetically driven valves59US 6,546,910 B2Toyota Jidosha Kabushiki Kaisha · 2003
- Electromagnetic linear actuator with position sensor46US 6,819,208 B1Johnson Controls Automotive Electronics · 2004
- Electromagnetically driven valve control apparatus and electromagnetically driven valve control method for internal combustion engine35US 6,866,012 B2Toyota Jidosha Kabushiki Kaisha · 2005
- Method of determining a clearance32US 7,121,525 B2Johnson Controls Technology Company · 2006