Autonomous unmanned aerial vehicle
US-11535375-B2 · Dec 27, 2022 · US
of piston type
of piston type · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B64D27/04 |
| Official title | of piston type |
| Display label | of piston type |
| Total patents | 108 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 8 |
| 2017 | 2 |
| 2018 | 10 |
| 2019 | 10 |
| 2020 | 9 |
| 2021 | 10 |
| 2022 | 17 |
| 2023 | 12 |
| 2024 | 17 |
| 2025 | 8 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Aircraft power plant with supercritical CO2 heat engine
US-11485504-B2 · Nov 1, 2022 · US
Electric distributed propulsion using exhaust recovery power
US-2022297843-A1 · Sep 22, 2022 · US
Concentric turbomachine with electric machine
US-11371350-B2 · Jun 28, 2022 · US
Hybrid-electric propulsion architecture and method for dissipating electrical energy in such an architecture
US-2022153423-A1 · May 19, 2022 · US
Aircraft power plant with supercritical co2 heat engine
US-2022127009-A1 · Apr 28, 2022 · US
Integrated heat management for hybrid propulsion
US-11292604-B2 · Apr 5, 2022 · US
Method and device for managing the energy supplied by a hybrid power plant for a rotorcraft
US-2022081122-A1 · Mar 17, 2022 · US
Propulsion system for an aircraft
US-2022063819-A1 · Mar 3, 2022 · US
High efficiency long range drone
US-11220334-B2 · Jan 11, 2022 · US
Aircraft with active support
US-11198503-B2 · Dec 14, 2021 · US
Unmanned Aerial Vehicle Power System for Minimizing Propulsion Failure
US-2021362866-A1 · Nov 25, 2021 · US
Protection functions
US-2021354841-A1 · Nov 18, 2021 · US
Aircraft engine nacelle
US-2021316871-A1 · Oct 14, 2021 · US
Centrifugal oil mist separator
US-2021189932-A1 · Jun 24, 2021 · US
Hybrid rotorcraft having at least one pusher or puller propeller, and an associated piloting method
US-2021163125-A1 · Jun 3, 2021 · US
Dual hybrid propulsion system for an aircraft having a cross-connecting clutch
US-2021101692-A1 · Apr 8, 2021 · US
Multistage turbocharging system for providing constant original critical altitude pressure input to high pressure stage turbocharger
US-10940954-B2 · Mar 9, 2021 · US
Vertical lift by series hybrid-propulsion
US-10899461-B2 · Jan 26, 2021 · US
High altitude air start equipment for aircraft reciprocating engine
US-10883466-B2 · Jan 5, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B64D27/04?
- CPC B64D27/04 is the Cooperative Patent Classification code for “of piston type.”
- How many patents are filed under CPC B64D27/04 (of piston type)?
- Our database includes 108 publications tagged with this CPC code.
- Is patent activity under CPC B64D27/04 growing?
- Publication counts under this code: 17 in 2024 vs 8 in 2025 (latest complete years).