F04D 27/009
Control: by bleeding, by passing or recycling fluid
Official title: {by bleeding, by passing or recycling fluid}
F04D27/009 (Control: by bleeding, by passing or recycling fluid) appears on 195 US grants and 204 published applications in this corpus.
Search patents in F04D- Granted patents
- 195
- Published applications
- 204
- Assignees
- 106
- Inventors
- 478
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 6 | 0 |
| 2002 | 1 | 4 |
| 2003 | 2 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 3 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 4 | 5 |
| 2013 | 0 | 8 |
| 2014 | 1 | 7 |
| 2015 | 4 | 20 |
| 2016 | 8 | 13 |
| 2017 | 14 | 37 |
| 2018 | 18 | 31 |
| 2019 | 39 | 15 |
| 2020 | 18 | 16 |
| 2021 | 17 | 15 |
| 2022 | 18 | 5 |
| 2023 | 7 | 4 |
| 2024 | 6 | 5 |
| 2025 | 8 | 4 |
| 2026 | 7 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air bleed slots for gas turbine engines6 Oct 2026US 12,753,725 B1Pratt & Whitney Canada Corp.
- Variable vane system for aircraft powerplant29 Sep 2026US 12,747,739 B1Rtx Corporation
- Compressor shroud with controllable bypass component formed of thermally adaptive materials and a thermoelectric junction14 Jul 2026US 12,680,550 B2Hamilton Sundstrand Corporation
- Compressor bleed air system with an actuator driven backflow valve for an aircraft engine23 Jun 2026US 12,662,969 B1Pratt & Whitney Canada Corp.
- Bleeding core air from a turbine engine core flowpath5 May 2026US 12,618,376 B2Rtx Corporation
- Gas Compressor20 Aug 2026US 2026/0243261 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Compressor bleed slot diffuser30 Jul 2026US 2026/0218652 A1Pratt & Whitney Canada Corp.
- Compression system, method for starting up compression system, and method for stopping compression system16 Jul 2026US 2026/0201895 A1Mitsubishi Heavy Industries, Ltd.
- Dynamic compressor system and methods of operation12 Mar 2026US 2026/0071630 A1Aerospace Carbon Solutions LLC
- Bleeding core air from a turbine engine core flowpath19 Feb 2026US 2026/0049579 A1Rtx Corporation
Most cited
By later US patents
- Variable-volume exhaust system169US 10,029,289 B2Greenheck Fan Corporation · 2018
- Fan assembly with heat sink45US 5,297,617 A1994
- Fan assembly with heat sink34US 5,445,215 A1995
- Turbo machines29US 6,290,458 B1Hitachi, Ltd. · 2001
- Geared turbofan gas turbine engine architecture26US 9,695,751 B2United Technologies Corporation · 2017