Tilt rotor control
US-2020207467-A1 · Jul 2, 2020 · US
Blade travel limiting devices, e.g. droop stops
Blade travel limiting devices, e.g. droop stops · 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 | B64C27/322 |
| Official title | {Blade travel limiting devices, e.g. droop stops} |
| Display label | Blade travel limiting devices, e.g. droop stops |
| Total patents | 95 |
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 | 3 |
| 2016 | 1 |
| 2017 | 37 |
| 2018 | 2 |
| 2019 | 14 |
| 2020 | 12 |
| 2021 | 9 |
| 2022 | 4 |
| 2023 | 3 |
| 2024 | 7 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Collective to elevator mixing of a rotary wing aircraft
US-10654565-B2 · May 19, 2020 · US
Passive Hub Flapping Lock
US-2020122826-A1 · Apr 23, 2020 · US
Mounting plates for rotor hub accessories
US-10501174-B2 · Dec 10, 2019 · US
Flapping abutment mechanism for a lift assembly, a rotorcraft rotor including the abutment mechanism, and a rotorcraft
US-10486804-B2 · Nov 26, 2019 · US
Bottom abutment device for a rotorcraft rotor, a rotorcraft rotor, and a rotorcraft
US-10464665-B2 · Nov 5, 2019 · US
Weights for water immersion testing
US-10457422-B2 · Oct 29, 2019 · US
Active vibration control of a rotorcraft
US-10443675-B2 · Oct 15, 2019 · US
Noise modes for rotary wing aircraft
US-10443674-B2 · Oct 15, 2019 · US
Rotor hub with enforced collective coning
US-2019300152-A1 · Oct 3, 2019 · US
Apparatus and Method for Removing Main Rotor Blades from Main Rotor Hub Yoke
US-2019300168-A1 · Oct 3, 2019 · US
Tip clearance measurement of a rotary wing aircraft
US-10400851-B2 · Sep 3, 2019 · US
Gimbal Lock Hook Systems for Rotorcraft
US-2019047692-A1 · Feb 14, 2019 · US
Rolling Gimbal Lock Systems for Rotorcraft
US-2019047691-A1 · Feb 14, 2019 · US
Elevator and rudder control of a rotorcraft
US-2019017569-A1 · Jan 17, 2019 · US
Mounting plates for rotor hub accessories
US-2019009896-A1 · Jan 10, 2019 · US
Main rotor rotational speed control for rotorcraft
US-10167079-B2 · Jan 1, 2019 · US
Aircraft with speed or acceleration command
US-2018231986-A1 · Aug 16, 2018 · US
Rotorcraft fall restraint protection attach points and mechanism systems
US-2018126199-A1 · May 10, 2018 · US
Elevator and rudder control of a rotorcraft
US-2017349275-A1 · Dec 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B64C27/322?
- CPC B64C27/322 is the Cooperative Patent Classification code for “Blade travel limiting devices, e.g. droop stops.”
- How many patents are filed under CPC B64C27/322 (Blade travel limiting devices, e.g. droop stops)?
- Our database includes 95 publications tagged with this CPC code.
- Is patent activity under CPC B64C27/322 growing?
- Publication counts under this code: 7 in 2024 vs 3 in 2025 (latest complete years).