Gas turbine engine with interdigitated turbine and gear assembly
US-11428160-B2 · Aug 30, 2022 · US
by counter rotation
by counter rotation · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F05D2250/44 |
| Official title | by counter rotation |
| Display label | by counter rotation |
| Total patents | 79 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 4 |
| 2017 | 3 |
| 2018 | 10 |
| 2019 | 7 |
| 2020 | 14 |
| 2021 | 9 |
| 2022 | 8 |
| 2023 | 5 |
| 2024 | 6 |
| 2025 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Aircraft turbomachine with mechanical reducer and contrarotative turbine
US-11415045-B2 · Aug 16, 2022 · US
Blade retention features for turbomachines
US-11414994-B2 · Aug 16, 2022 · US
Gas turbine engine with interdigitated turbine and gear assembly
US-2022205387-A1 · Jun 30, 2022 · US
Gas turbine for twin-rotor aircraft
US-2022178331-A1 · Jun 9, 2022 · US
Turbine engine component with a set of deflectors
US-2021381389-A1 · Dec 9, 2021 · US
Thrust reverser
US-11187187-B2 · Nov 30, 2021 · US
Blade retention features for turbomachines
US-11156109-B2 · Oct 26, 2021 · US
Outer drum rotor assembly
US-11085309-B2 · Aug 10, 2021 · US
System for changing the pitch of a turboprop engine comprising an upstream pair of contrarotating propellers
US-11052994-B2 · Jul 6, 2021 · US
Blade retention features for turbomachines
US-2021108522-A1 · Apr 15, 2021 · US
Rotatable torque frame for gas turbine engine
US-10961850-B2 · Mar 30, 2021 · US
Blade retention features for turbomachines
US-2021047930-A1 · Feb 18, 2021 · US
Inner band for turbine engine
US-2021032999-A1 · Feb 4, 2021 · US
Geared turbofan with three turbines all counter-rotating
US-10830130-B2 · Nov 10, 2020 · US
Counter rotating turbine with reversing speed reduction assembly
US-10815881-B2 · Oct 27, 2020 · US
Counter rotating turbine with reversing reduction gear assembly
US-10801442-B2 · Oct 13, 2020 · US
Rotor for a contrarotating turbine of a turbine engine
US-2020284150-A1 · Sep 10, 2020 · US
Electric turbomachine
US-2020263545-A1 · Aug 20, 2020 · US
Aircraft comprising a turbojet engine integrated into the rear fuselage comprising a fairing allowing the ejection of blades
US-10746044-B2 · Aug 18, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F05D2250/44?
- CPC F05D2250/44 is the Cooperative Patent Classification code for “by counter rotation.”
- How many patents are filed under CPC F05D2250/44 (by counter rotation)?
- Our database includes 79 publications tagged with this CPC code.
- Is patent activity under CPC F05D2250/44 growing?
- Publication counts under this code: 6 in 2024 vs 5 in 2025 (latest complete years).