Rotor assembly for a rotorcraft with torque controlled collective pitch
US-11203422-B2 · Dec 21, 2021 · US
with individually articulated blades, i.e. with flapping or drag hinges
with individually articulated blades, i.e. with flapping or drag hinges · 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 | B64C27/39 |
| Official title | with individually articulated blades, i.e. with flapping or drag hinges |
| Display label | with individually articulated blades, i.e. with flapping or drag hinges |
| Total patents | 81 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 7 |
| 2017 | 5 |
| 2018 | 9 |
| 2019 | 20 |
| 2020 | 13 |
| 2021 | 7 |
| 2022 | 2 |
| 2023 | 8 |
| 2024 | 3 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Inboard beam with pin system for anti-rotation and centrifugal force retention
US-10960970-B2 · Mar 30, 2021 · US
Rotorcraft centrifugal force bearing
US-10864985-B2 · Dec 15, 2020 · US
Drive link mounted flapping sensor systems
US-10829242-B2 · Nov 10, 2020 · US
Hinge mechanism for a weight-shifting coaxial helicopter
US-10814968-B2 · Oct 27, 2020 · US
Soft-in-plane proprotor systems
US-10793254-B2 · Oct 6, 2020 · US
Variable sweep rotorcraft blade tip
US-10787251-B2 · Sep 29, 2020 · US
Rotor hub with blade-to-blade dampers attached to the pitch change axis
US-10773798-B2 · Sep 15, 2020 · US
Passive pitch angle adjustment apparatus
US-10723450-B2 · Jul 28, 2020 · US
Tail rotor integrated damper attachment
US-10689104-B2 · Jun 23, 2020 · US
Rotor hub with enforced collective coning
US-10654558-B2 · May 19, 2020 · US
Inboard beam with pin system for anti-rotation and centrifugal force retention
US-2020148332-A1 · May 14, 2020 · US
Passive variable pitch propellers
US-2020140073-A1 · May 7, 2020 · US
Articulated rotor systems with blade-to-blade damping
US-10597150-B2 · Mar 24, 2020 · US
Low moment rotor hub
US-10597143-B2 · Mar 24, 2020 · US
Inboard bearing assemblies with anti-rotation features
US-10514060-B2 · Dec 24, 2019 · US
Propeller with passive variable pitch and rotatable base
US-10479482-B1 · Nov 19, 2019 · US
Damage tolerant and fail-safe (DTFS) high strength preloaded pin assembly
US-10480566-B2 · Nov 19, 2019 · US
Drive link mounted flapping sensor systems
US-2019329901-A1 · Oct 31, 2019 · US
Articulated Rotor Systems with Blade-to-Blade Damping
US-2019322363-A1 · Oct 24, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B64C27/39?
- CPC B64C27/39 is the Cooperative Patent Classification code for “with individually articulated blades, i.e. with flapping or drag hinges.”
- How many patents are filed under CPC B64C27/39 (with individually articulated blades, i.e. with flapping or drag hinges)?
- Our database includes 81 publications tagged with this CPC code.
- Is patent activity under CPC B64C27/39 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).