F05D 2220/50
Application: for auxiliary power units
Official title: for auxiliary power units (APU's)
F05D2220/50 (Application: for auxiliary power units) appears on 596 US grants and 528 published applications in this corpus.
Search patents in F05D- Granted patents
- 596
- Published applications
- 528
- Assignees
- 110
- Inventors
- 1,082
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 12 | 0 |
| 1990 | 4 | 0 |
| 1991 | 10 | 0 |
| 1992 | 24 | 0 |
| 1993 | 18 | 0 |
| 1994 | 16 | 0 |
| 1995 | 6 | 0 |
| 1996 | 6 | 0 |
| 1997 | 6 | 0 |
| 1998 | 9 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 13 | 0 |
| 2002 | 7 | 7 |
| 2003 | 6 | 3 |
| 2004 | 3 | 5 |
| 2005 | 6 | 11 |
| 2006 | 9 | 17 |
| 2007 | 9 | 18 |
| 2008 | 12 | 16 |
| 2009 | 13 | 15 |
| 2010 | 10 | 16 |
| 2011 | 10 | 9 |
| 2012 | 11 | 22 |
| 2013 | 6 | 25 |
| 2014 | 22 | 20 |
| 2015 | 15 | 13 |
| 2016 | 12 | 32 |
| 2017 | 25 | 34 |
| 2018 | 19 | 38 |
| 2019 | 36 | 28 |
| 2020 | 29 | 55 |
| 2021 | 35 | 42 |
| 2022 | 38 | 24 |
| 2023 | 39 | 25 |
| 2024 | 30 | 23 |
| 2025 | 22 | 19 |
| 2026 | 8 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hybrid gas turbofan powered idle descent mode15 Sep 2026US 12,735,991 B2Rtx Corporation
- Auxiliary power unit comprising a gas generator in direct-drive connection with an electric generator and an accessory gearbox18 Aug 2026US 12,710,012 B2Safran Power Units
- Low pressure recovery inlet for gas turbine engine turbomachinery on aircraft4 Aug 2026US 12,698,738 B1Rolls-Royce North American Technologies Inc.
- Electric machine cooled with bypass air of a turbofan engine4 Aug 2026US 12,700,772 B2Pratt & Whitney Canada Corp.
- Identification module for turbine engine or auxiliary power unit with extended data storage capacity14 Jul 2026US 12,680,500 B2Pratt & Whitney Canada Corp.
- Low pressure recovery inlet for gas turbine engine turbomachinery on aircraft6 Aug 2026US 2026/0226860 A1Rolls-Royce North American Technologies Inc.
- Powerplant Assembly for an Aircraft16 Jul 2026US 2026/0200581 A1Pratt & Whitney Canada Corp.
- System and method for reducing wear in a gearbox during a wash event of a gas turbine engine18 Jun 2026US 2026/0168394 A1General Electric Company
- System and method for cleaning gas turbine engines18 Jun 2026US 2026/0168401 A1General Electric Company
- Method and computer program for detecting surge events in a turbine engine28 May 2026US 2026/0146560 A1Airbus Operations S.L.U.
Most cited
By later US patents
- Thermal and energy management method and apparatus for an aircraft164US 6,182,435 B2Hamilton Sundstrand Corporation · 2001
- Integrated air conditioning and power unit147US 5,899,085 AMcDonnell Douglas Corporation · 1999
- Microturbomachinery145US 5,932,940 AMassachusetts Institute of Technology · 1999
- Tortuous path quiet exhaust eductor system134US 6,615,576 B2Honeywell International Inc. · 2003
- Gas turbine engine system127US 5,867,979 AROLLS-ROYCE plc · 1999