F01L 2001/34483
Phaser return springs
Official title: {Phaser return springs}
F01L2001/34483 (Phaser return springs) appears on 452 US grants and 468 published applications in this corpus.
Search patents in F01L- Granted patents
- 452
- Published applications
- 468
- Assignees
- 88
- Inventors
- 551
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 9 |
| 2002 | 20 | 17 |
| 2003 | 10 | 15 |
| 2004 | 16 | 14 |
| 2005 | 14 | 25 |
| 2006 | 17 | 14 |
| 2007 | 14 | 21 |
| 2008 | 13 | 14 |
| 2009 | 11 | 25 |
| 2010 | 11 | 34 |
| 2011 | 19 | 31 |
| 2012 | 26 | 28 |
| 2013 | 20 | 27 |
| 2014 | 31 | 16 |
| 2015 | 31 | 24 |
| 2016 | 20 | 23 |
| 2017 | 16 | 37 |
| 2018 | 36 | 22 |
| 2019 | 28 | 28 |
| 2020 | 28 | 24 |
| 2021 | 22 | 7 |
| 2022 | 5 | 4 |
| 2023 | 7 | 4 |
| 2024 | 5 | 3 |
| 2025 | 1 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Valve opening-closing timing control device30 Jun 2026US 12,669,072 B2Aisin Corporation
- Camshaft adjustment system for flexibly starting an internal combustion engine, and method for operating a drivetrain27 Jan 2026US 12,535,019 B2Schaeffler Technologies AG & Co. KG
- Camshaft phaser having non-return valves1 Apr 2025US 12,264,603 B2Schaeffler Technologies AG & Co. KG
- Systems and methods for backlash compensation in cam phasing systems18 Jun 2024US 12,012,877 B2HUSCO Automotive Holdings LLC
- System and method for variable valve timing4 Jun 2024US 12,000,314 B1
- Valve opening-closing timing control device25 Sep 2025US 2025/0297560 A1Aisin Corporation
- Camshaft phaser having non-return valves23 Jan 2025US 2025/0027432 A1Schaeffler Technologies AG & Co. KG
- Camshaft adjustment system for flexibly starting an internal combustion engine, and method for operating a drivetrain29 Aug 2024US 2024/0287921 A1Schaeffler Technologies AG & Co. KG
- Camshaft Phaser7 Mar 2024US 2024/0077004 A1Mechadyne International Ltd.
- Valve timing adjustment device and method for manufacturing valve timing adjustment device15 Feb 2024US 2024/0052764 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Variable valve timing control system80US 6,330,870 B1Denso Corporation · 2001
- Apparatus for adjusting a rotational angular relationship between a camshaft and its drive element45US 5,056,477 ARobert Bosch GmbH · 1991
- Variable valve timing control apparatus and method for engines42US 6,505,586 B1Denso Corporation · 2003
- Cam phaser having a torsional bias spring to offset retarding force of camshaft friction39US 6,276,321 B1Delphi Technologies, Inc. · 2001
- Variable valve timing control device for internal combustion engine34US 6,405,694 B2Denso Corporation · 2002