F05D 2220/329
In helicopters
Official title: in helicopters
F05D2220/329 (In helicopters) appears on 353 US grants and 418 published applications in this corpus.
Search patents in F05D- Granted patents
- 353
- Published applications
- 418
- Assignees
- 70
- Inventors
- 597
- Latest grant
- 25 Aug 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 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 2 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 2 | 3 |
| 2007 | 0 | 3 |
| 2008 | 1 | 4 |
| 2009 | 1 | 7 |
| 2010 | 4 | 9 |
| 2011 | 6 | 8 |
| 2012 | 8 | 12 |
| 2013 | 3 | 20 |
| 2014 | 11 | 10 |
| 2015 | 14 | 17 |
| 2016 | 20 | 33 |
| 2017 | 10 | 59 |
| 2018 | 27 | 37 |
| 2019 | 29 | 22 |
| 2020 | 39 | 37 |
| 2021 | 30 | 47 |
| 2022 | 39 | 25 |
| 2023 | 39 | 26 |
| 2024 | 22 | 12 |
| 2025 | 20 | 11 |
| 2026 | 8 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotorcraft with powerplant exhaust sound attenuation25 Aug 2026US 12,715,576 B2Pratt & Whitney Canada Corp.
- Testing secondary power system of aircraft powerplant19 May 2026US 12,631,525 B2Pratt & Whitney Canada Corp.
- Exhaust case for aircraft engine5 May 2026US 12,617,541 B1Pratt & Whitney Canada Corp.
- Turbine exhaust case with stiffening brace5 May 2026US 12,618,342 B1Pratt & Whitney Canada Corp.
- Impeller containment system21 Apr 2026US 12,607,201 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
- Pulse modulation technique for gas turbine engines30 Jul 2026US 2026/0218663 A1Textron Innovations Inc.
- Improved hybrid turboprop engine for aircraft9 Jul 2026US 2026/0192933 A1Safran Helicopter Engines
- Exhaust case for aircraft engine25 Jun 2026US 2026/0175991 A1Pratt & Whitney Canada Corp.
- Turbine exhaust duct for aircraft engine25 Jun 2026US 2026/0176983 A1Pratt & Whitney Canada Corp.
Most cited
By later US patents
- Electrically coupled supercharger for a gas turbine engine51US 7,513,120 B2United Technologies Corporation · 2009
- Multi spool gas turbine system49US 8,220,245 B1Candent Technologies, Inc. · 2012
- Continuous performance analysis system and method47US 8,068,997 B2Honeywell International Inc. · 2011
- Gas turbine engine46US 5,727,378 AGreat Lakes Helicopters Inc. · 1998
- Architecture of a multiple-engine helicopter propulsion system, and corresponding helicopter36US 10,766,629 B2Safran Helicopter Engines · 2020