Vertical Takeoff and Landing Aircraft
US-2019023389-A1 · Jan 24, 2019 · US
of series-parallel type
of series-parallel 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 | B64D35/023 |
| Official title | of series-parallel type |
| Display label | of series-parallel type |
| Total patents | 407 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 9 |
| 2017 | 15 |
| 2018 | 28 |
| 2019 | 36 |
| 2020 | 56 |
| 2021 | 51 |
| 2022 | 51 |
| 2023 | 56 |
| 2024 | 51 |
| 2025 | 37 |
| 2026 | 10 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Aerial vehicle
US-2018354613-A1 · Dec 13, 2018 · US
Hybrid-electric propulsion system for an aircraft
US-2018354631-A1 · Dec 13, 2018 · US
Propulsion system for an aircraft
US-2018339780-A1 · Nov 29, 2018 · US
Electric propulsion system for an aircraft
US-10137981-B2 · Nov 27, 2018 · US
Aircraft electrical network
US-10131441-B2 · Nov 20, 2018 · US
Electric propulsion system
US-10093428-B2 · Oct 9, 2018 · US
Electric Propulsion System for an Aircraft
US-2018281931-A1 · Oct 4, 2018 · US
Embedded electric machine
US-10071811-B2 · Sep 11, 2018 · US
Hybrid propulsion drive train system for tiltrotor aircraft
US-2018251226-A1 · Sep 6, 2018 · US
Propulsion system for an aircraft
US-2018230845-A1 · Aug 16, 2018 · US
Hybrid contingency power drive system
US-10040566-B2 · Aug 7, 2018 · US
System for redundant supply of kinetic energy to drive system of aircraft
US-2018201384-A1 · Jul 19, 2018 · US
Propeller drives and vehicles
US-2018201383-A1 · Jul 19, 2018 · US
Power transmission gearbox and an aircraft
US-10012305-B2 · Jul 3, 2018 · US
Hybrid-electric drive system
US-2018163558-A1 · Jun 14, 2018 · US
Hybrid electric aircraft propulsion system with motors using induction effect
US-2018141671-A1 · May 24, 2018 · US
Turboelectric Aircraft with Aft Propulsion
US-2018127089-A1 · May 10, 2018 · US
Nacelle for an aircraft aft fan
US-2018093776-A1 · Apr 5, 2018 · US
Aircraft propulsion system
US-2018079515-A1 · Mar 22, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B64D35/023?
- CPC B64D35/023 is the Cooperative Patent Classification code for “of series-parallel type.”
- How many patents are filed under CPC B64D35/023 (of series-parallel type)?
- Our database includes 407 publications tagged with this CPC code.
- Is patent activity under CPC B64D35/023 growing?
- Publication counts under this code: 51 in 2024 vs 37 in 2025 (latest complete years).