F05D 2270/023
Of different spools or shafts
Official title: of different spools or shafts
F05D2270/023 (Of different spools or shafts) appears on 98 US grants and 107 published applications in this corpus.
Search patents in F05D- Granted patents
- 98
- Published applications
- 107
- Assignees
- 44
- Inventors
- 167
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 7 |
| 2008 | 1 | 2 |
| 2009 | 3 | 0 |
| 2010 | 2 | 2 |
| 2011 | 2 | 3 |
| 2012 | 2 | 2 |
| 2013 | 4 | 4 |
| 2014 | 2 | 4 |
| 2015 | 1 | 4 |
| 2016 | 2 | 3 |
| 2017 | 2 | 8 |
| 2018 | 1 | 4 |
| 2019 | 8 | 7 |
| 2020 | 6 | 18 |
| 2021 | 15 | 14 |
| 2022 | 6 | 10 |
| 2023 | 14 | 7 |
| 2024 | 10 | 2 |
| 2025 | 4 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hybrid gas turbine engine starting control30 Jun 2026US 12,668,368 B2Rtx Corporation
- Systems and methods to operate a dual-shaft gas turbine engine for hydraulic fracturing24 Mar 2026US 12,584,394 B2BJ Energy Solutions, LLC
- Method for regulating a turbomachine11 Nov 2025US 12,467,413 B2Safran
- Multi-mode starter control for gas turbine engines30 Sep 2025US 12,428,997 B2Rtx Corporation
- Propulsion system for an aircraft2 Sep 2025US 12,404,030 B2General Electric Company
- Two-speed epicyclic gearbox with clutch for aircraft propulsion system24 Sep 2026US 2026/0286902 A1Pratt & Whitney Canada Corp.
- Multi-mode starter control for gas turbine engines24 Jul 2025US 2025/0237173 A1Rtx Corporation
- Method for regulating a turbomachine26 Sep 2024US 2024/0318604 A1Safran
- Systems and methods to operate a dual-shaft gas turbine engine for hydraulic fracturing25 Apr 2024US 2024/0133282 A1BJ Energy Solutions, LLC
- Increasing surge margin and compression efficiency via shaft power transfer19 Oct 2023US 2023/0332509 A1ROLLS-ROYCE plc
Most cited
By later US patents
- Systems and methods to operate a dual-shaft gas turbine engine for hydraulic fracturing114US 11,125,066 B1BJ Energy Solutions, LLC · 2021
- Electrically coupled supercharger for a gas turbine engine51US 7,513,120 B2United Technologies Corporation · 2009
- Turbomachine with an electric machine assembly and method for operation49US 10,644,630 B2General Electric Company · 2020
- Fuel control system for a gas turbine47US 4,341,071 ANissan Motor Co., Ltd. · 1982
- Fan array fan section in air-handling systems35US 7,137,775 B2Huntair, Inc. · 2006