F01L
Cyclically operating valves for machines or engines
F01L (Cyclically operating valves for machines or engines) appears on 14,626 US grants and 10,711 published applications in this corpus.
Search patents in F01L- Granted patents
- 14,626
- Published applications
- 10,711
- Assignees
- 2,008
- Inventors
- 15,249
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 93 | 0 |
| 1977 | 88 | 0 |
| 1978 | 87 | 0 |
| 1979 | 71 | 0 |
| 1980 | 97 | 0 |
| 1981 | 79 | 0 |
| 1982 | 92 | 0 |
| 1983 | 96 | 0 |
| 1984 | 140 | 0 |
| 1985 | 166 | 0 |
| 1986 | 150 | 0 |
| 1987 | 186 | 0 |
| 1988 | 195 | 0 |
| 1989 | 247 | 0 |
| 1990 | 208 | 0 |
| 1991 | 252 | 0 |
| 1992 | 247 | 0 |
| 1993 | 261 | 0 |
| 1994 | 231 | 0 |
| 1995 | 191 | 0 |
| 1996 | 237 | 0 |
| 1997 | 279 | 0 |
| 1998 | 322 | 0 |
| 1999 | 293 | 0 |
| 2000 | 288 | 0 |
| 2001 | 460 | 181 |
| 2002 | 471 | 466 |
| 2003 | 482 | 465 |
| 2004 | 425 | 467 |
| 2005 | 411 | 574 |
| 2006 | 457 | 509 |
| 2007 | 430 | 570 |
| 2008 | 376 | 528 |
| 2009 | 306 | 580 |
| 2010 | 373 | 482 |
| 2011 | 376 | 416 |
| 2012 | 395 | 442 |
| 2013 | 402 | 477 |
| 2014 | 476 | 441 |
| 2015 | 444 | 496 |
| 2016 | 381 | 576 |
| 2017 | 445 | 608 |
| 2018 | 504 | 491 |
| 2019 | 545 | 458 |
| 2020 | 521 | 436 |
| 2021 | 391 | 322 |
| 2022 | 328 | 263 |
| 2023 | 218 | 161 |
| 2024 | 208 | 136 |
| 2025 | 139 | 102 |
| 2026 | 66 | 64 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F01L 1/00Valve-gear or valve arrangements10,493
- F01L 13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or4,281
- F01L 9/00Valve-gear or valve arrangements actuated non-mechanically2,017
- F01L 2820/00Details on specific features characterising valve gear arrangementsIndexing code1,742
- F01L 2305/00Valve arrangements comprising rollersIndexing code1,700
- F01L 3/00Lift-valve, i.e. cut-off apparatus with closure members having at least a component1,689
- F01L 2800/00Methods of operation using a variable valve timing mechanismIndexing code1,632
- F01L 2303/00Manufacturing of components used in valve arrangementsIndexing code1,193
All 34 main groupsShow fewer
- F01L 2301/00Cyclically operating valves for machines or engines: using particular materialsIndexing code1,035
- F01L 7/00Rotary or oscillatory slide valve-gear or valve arrangements574
- F01L 2810/00Arrangements solving specific problems in relation with valve gearsIndexing code548
- F01L 2250/00Camshaft drives characterised by their transmission meansIndexing code462
- F01L 2201/00Electronic control systemsIndexing code359
- F01L 25/00Drive, or adjustment during the operation, or distribution or expansion valves by277
- F01L 2307/00Preventing the rotation of tappetsIndexing code205
- F01L 5/00Slide valve-gear or valve-arrangements136
- F01L 23/00Valves controlled by impact by piston123
- F01L 21/00Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting102
- F01L 2760/00Control of valve gear to facilitate reversing, starting, braking of four strokeIndexing code64
- F01L 11/00Valve arrangements in working piston or piston-rod54
- F01L 15/00Valve-gear or valve arrangements49
- F01L 31/00Valve drive, valve adjustment during operation, or other valve control, not provided46
- F01L 2309/00Self-contained lash adjustersIndexing code42
- F01L 33/00Rotary or oscillatory slide valve-gear or valve arrangements, specially adapted for machines38
- F01L 2313/00Rotary valve drivesIndexing code22
- F01L 17/00Slide valve-gear or valve arrangements with cylindrical, sleeve, or part annularly-shaped valves18
- F01L 2710/00Control of valve gear, speed or powerIndexing code14
- F01L 35/00Lift valve-gear or valve arrangements specially adapted for machines or engines with12
- F01L 27/00Distribution or expansion valve-gear peculiar to free-piston machines or engines and not9
- F01L 2311/00Differential gears located between crankshafts and camshafts for varying the timing ofIndexing code7
- F01L 19/00Slide valve-gear or valve arrangements with reciprocatory and other movement of same6
- F01L 29/00Reversing-gear6
- F01L 2740/00Control of slide-valve gearIndexing code2
- F01L 2750/00Control of valve gear for four stroke engines directly driven by theIndexing code2
Recent patents
- Valve lift conversion control mechanism and valve system of engine29 Sep 2026US 12,747,682 B2Weichai Power Co., Ltd.
- Variable displacement valvetrain systems with rocker shaft porting and insert sleeves for engine cylinder deactivation22 Sep 2026US 12,742,403 B2GM Global Technology Operations LLC
- Internal combustion engine22 Sep 2026US 12,742,404 B2Toyota Jidosha Kabushiki Kaisha
- Cylinder head cover, and method for installing a cylinder head cover8 Sep 2026US 12,729,634 B2thyssenkrupp AG
- Carrier-less spring loaded planetary gearset used with eVCT8 Sep 2026US 12,729,635 B2BorgWarner Inc.
- Camshaft8 Oct 2026US 2026/0309059 A1Subaru Corporation
- Vane seal spring8 Oct 2026US 2026/0309060 A1
- Variable cam timing phaser8 Oct 2026US 2026/0309061 A1
- Variable cam timing phaser and method of assembling the same8 Oct 2026US 2026/0309062 A1
- Carrier-less spring loaded planetary gearset used with evct8 Oct 2026US 2026/0309063 A1BorgWarner Inc.
Most cited
By later US patents
- Internal combustion engine with auxiliary combustion chamber1,410US 4,106,446 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1978
- Electromagnetic actuator889US 6,366,441 B1Honda Giken Kogyo Kabushiki Kaisha · 2002
- Rolled electroactive polymers307US 6,891,317 B2SRI International · 2005
- System for controllably disabling cylinders in an internal combustion engine206US 6,619,258 B2Delphi Technologies, Inc. · 2003
- Skip-cycle strategies for four cycle engine202US 5,377,631 AFord Motor Company · 1995