B64D 31/12
For equalising or synchronising power plants
Official title: for equalising or synchronising power plants
B64D31/12 (For equalising or synchronising power plants) appears on 134 US grants and 150 published applications in this corpus.
Search patents in B64D- Granted patents
- 134
- Published applications
- 150
- Assignees
- 70
- Inventors
- 274
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 2 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 2 |
| 2009 | 0 | 2 |
| 2010 | 0 | 4 |
| 2011 | 3 | 5 |
| 2012 | 0 | 0 |
| 2013 | 4 | 1 |
| 2014 | 4 | 2 |
| 2015 | 1 | 2 |
| 2016 | 5 | 8 |
| 2017 | 5 | 5 |
| 2018 | 3 | 13 |
| 2019 | 8 | 7 |
| 2020 | 13 | 12 |
| 2021 | 9 | 18 |
| 2022 | 5 | 13 |
| 2023 | 17 | 19 |
| 2024 | 18 | 16 |
| 2025 | 19 | 8 |
| 2026 | 5 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Aircraft hybrid electric propulsion and attitude controller15 Sep 2026US 12,735,191 B2Rtx Corporation
- Gas turbine acceleration limit biasing for premature asymmetric operating regime exits26 May 2026US 12,637,986 B2Pratt & Whitney Canada Corp.
- Method for controlling a rotorcraft, associated rotorcraft and computer program7 Apr 2026US 12,595,049 B2Airbus Helicopters
- Systems and methods for flight control of aircraft24 Mar 2026US 12,583,579 B2Archer Aviation Inc.
- Engine characteristics matching17 Mar 2026US 12,576,976 B2Pratt & Whitney Canada Corp.
- Method and system for assisting with the piloting of a rotary wing aircraft in a fuel economy mode30 Jul 2026US 2026/0217376 A1Safran Helicopter Engines
- Systems and methods for flight control of aircraft9 Jul 2026US 2026/0192919 A1Archer Aviation Inc.
- System for mimicking the behavior of a multi-engine aircraft with a single engine aircraft25 Jun 2026US 2026/0175968 A1Daher Aerospace
- Gas turbine acceleration limit biasing for premature asymmetric operating regime exits21 May 2026US 2026/0139634 A1Pratt & Whitney Canada Corp.
- Phase synchronization of vehicle engines to reduce noise and vibration30 Apr 2026US 2026/0116563 A1Gulfstream Aerospace Corporation
Most cited
By later US patents
- Unmanned aerial vehicle motor driving randomization and feedback for noise abatement102US 9,415,870 B1Amazon Technologies, Inc. · 2016
- Engine failure monitor for a multi-engine aircraft having partial engine failure and driveshaft failure detection63US 5,363,317 AUnited Technologies Corporation · 1994
- Rotorcraft engine and rotor speed synchronization39US 7,866,598 B2Karem Aircraft, Inc. · 2011
- Propeller phase control apparatus32US 4,934,825 AUnited Technologies Corporation · 1990
- Electrically powered aerial vehicles and flight control methods28US 9,346,542 B2SkyKar Inc. · 2016