F16F 15/223
Use of systems involving rotary unbalanced masses where the phase-angle of masses
Official title: {Use of systems involving rotary unbalanced masses where the phase-angle of masses mounted on counter-rotating shafts can be varied (generation of mechanical vibrations per se with such systems B06B1/166)}
F16F15/223 (Use of systems involving rotary unbalanced masses where the phase-angle of masses) appears on 27 US grants and 29 published applications in this corpus.
Search patents in F16F- Granted patents
- 27
- Published applications
- 29
- Assignees
- 16
- Inventors
- 55
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 3 |
| 2011 | 0 | 1 |
| 2012 | 2 | 1 |
| 2013 | 3 | 1 |
| 2014 | 2 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 2 |
| 2017 | 0 | 1 |
| 2018 | 2 | 3 |
| 2019 | 0 | 1 |
| 2020 | 3 | 5 |
| 2021 | 3 | 5 |
| 2022 | 2 | 0 |
| 2023 | 5 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Vibration control assembly4 Feb 2025US 12,214,869 B2Lockheed Martin Corporation
- Circular force generator having a self-contained positioning sensor assembly12 Dec 2023US 11,841,063 B2GHSP, Inc.
- Vibration control assembly24 Oct 2023US 11,794,883 B2Lockheed Martin Corporation
- Rotor hub vibration attenuator27 Jun 2023US 11,685,521 B2Textron Innovations Inc.
- Variable rotary mass vibration suppression system17 Jan 2023US 11,555,528 B2Moog Inc.
- Vibration control assembly22 Feb 2024US 2024/0059405 A1Lockheed Martin Corporation
- Rotor hub vibration attenuator25 Nov 2021US 2021/0362842 A1Textron Innovations Inc.
- Vibration control assembly21 Oct 2021US 2021/0323658 A1Lockheed Martin Corporation
- Device for damping vibrations in a structure10 Jun 2021US 2021/0172490 A1Soletanche Freyssinet
- Variable rotary pendulous mass vibration suppression system13 May 2021US 2021/0139137 A1Moog Inc.
Most cited
By later US patents
- Method and apparatus for cancellation of rotational unbalance33US 5,347,884 AMoog Inc. · 1994
- Helicopter vibration control system and rotating assembly rotary forces generators for canceling vibrations27US 8,435,002 B2Lord Corporation · 2013
- Servo-control system for an unbalanced rotor vibrator25US 7,471,057 B2Eurocopter · 2008
- Machinery for improving performance irregularities arising from vibrations19US 7,047,109 B2Mitutoyo Corporation · 2006
- Helicopter hub mounted vibration control and circular force generation systems for canceling vibrations19US 8,267,652 B2Lord Corporation · 2012