ClassID:

72145

B64C27/64 - CPC Classification

Classification description:

Rotorcraft; Rotors peculiar thereto; Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement; Transmitting means mechanical using fluid pressure

Recent Application in this class:
#1
20260109453
2026-04-23

SYSTEM FOR TRANSMITTING COMMANDS TO A PLURALITY OF HYDRAULIC SERVO-ACTUATORS

#2
20250346368
2025-11-13

LINEAR ACTUATING DEVICE AND ASSOCIATED AIRCRAFT ROTOR TEST BENCH

#3
20250313333
2025-10-09

Axially Aligned Triplex Linear Hydraulic Actuators

#4
20250074583
2025-03-06

PROPULSOR EXTERNAL HYDRAULIC CONTROL SYSTEM

#5
20240391585
2024-11-28

Aerial vehicle

#6
20240343388
2024-10-17

TILT ROTOR CONTROL

#7
20240093704
2024-03-21

CONTROL MODULE FOR HYDRAULIC SYSTEM

#8
20230322375
2023-10-12

Helicopter rotor system

#9
20230322374
2023-10-12

Removable trailing edge assembly and system for rotor blade trailing edge actuation

#10
20230286648
2023-09-14

Harmonic control actuator for aircraft

#11
20230279847
2023-09-07

Hub Feed Oil System

#12
20230271699
2023-08-31

Aerial vehicle

#13
20230174228
2023-06-08

Stability and control augmentation system

#14
20230159155
2023-05-25

Propeller blade pitch change actuation system

#15
20230037680
2023-02-09

Aerial vehicle

#16
20220372999
2022-11-24

Control module for hydraulic system

#17
20220243606
2022-08-04

Propeller control unit

#18
20220119102
2022-04-21

Aerial vehicle

#19
20220106033
2022-04-07

THRUST PRODUCING GYROSCOPE AUTOROTATION SAFETY SYSTEM METHOD AND APPARATUS

#20
20220041266
2022-02-10

Dual-concentric control valve with direct drive control and failed motor protection

#21
20210384850
2021-12-09

DISTRIBUTED PROPULSION WITH THERMAL MANAGEMENT

#22
20210323661
2021-10-21

Coaxial helicopter and control method thereof

#23
20210246914
2021-08-12

Control module for hydraulic system

#24
20210245871
2021-08-12

Rotorcraft autopilot and methods

#25
20210229826
2021-07-29

ROTARY WING AIRCRAFT PROVIDED WITH A TRANSMISSION SYSTEM COMPRISING AN EMERGENCY ELECTRIC MOTOR

#26
20210206474
2021-07-08

Propeller blade pitch angle feedback from actuator rotation

#27
20210163128
2021-06-03

Electronic control of blade pitch on a tiltrotor

#28
20210107624
2021-04-15

Spring-loaded link

#29
20200255123
2020-08-13

Aircraft turboprop engine propeller pitch control system including a controllable feather valve

#30
20200207467
2020-07-02

Tilt rotor control

#31
20200023958
2020-01-23

Rotorcraft anti-torque systems and methods therefor

#32
20200003314
2020-01-02

Hydraulic actuator force fight mitigation mechanism

#33
20190352003
2019-11-21

Rotorcraft autopilot and methods

#34
20190344885
2019-11-14

Actuator system for a fly-by-wire aircraft

#35
20190178266
2019-06-13

Servo control, rotor and aircraft

#36
20190072952
2019-03-07

Automatic envelope limiting based on detected hydraulic failures

#37
20190071172
2019-03-07

Hydraulic multi-rotor aerial vehicle

#38
20180340579
2018-11-29

Magnetorheological fluid clutch apparatus and control systems

#39
20180334242
2018-11-22

System and method for aircraft propeller control

#40
20180319492
2018-11-08

ROTOR BLADE STRUCTURES

#41
20180281940
2018-10-04

Servo actuators

#42
20180265210
2018-09-20

Fume tight sock collector/box

#43
20180093763
2018-04-05

Rotorcraft autopilot and methods

#44
20180057146
2018-03-01

Propeller pitch control actuation system

#45
20180029701
2018-02-01

Jam-Tolerant Rotary Control Motor for Hydraulic Actuator Valve

#46
20180002007
2018-01-04

Duplicated hydraulic circuit with pressure regulation

#47
20170361919
2017-12-21

Propeller blade angle control system

#48
20170307090
2017-10-26

Hydraulic actuator force fight mitigation mechanism

#49
20170306852
2017-10-26

Electrical and mechanical connections through firewall

#50
20170225777
2017-08-10

Autogyro

#51
20170057629
2017-03-02

Separation of collective and cyclic actuation

#52
20170043868
2017-02-16

Damper device and an aircraft

#53
20160340034
2016-11-24

Jam-tolerant rotary control motor for hydraulic actuator valve

#54
20160333947
2016-11-17

Magnetorheological fluid clutch apparatus and control systems

#55
20160304190
2016-10-20

Artificial force feel generating device for a vehicle control system of a vehicle and, in particular, of an aircraft

#56
20160264239
2016-09-15

Compact linear hydraulic actuator

#57
20160236773
2016-08-18

DYNAMIC PITCH ADJUSTMENT DEVICES, SYSTEMS, AND METHODS

#58
20160221674
2016-08-04

Magnetorheological actuator with torsional spring

#59
20160221673
2016-08-04

Electro-hydraulic on-blade actuation system

#60
20160221672
2016-08-04

Magnetorheological haptic trim actuator

#61
20160159475
2016-06-09

Individual blade control utilizing pneumatic muscles

#62
20160152330
2016-06-02

Rotorcraft autopilot and methods

#63
20160083088
2016-03-24

Vibration control with active lag damper

#64
20160046371
2016-02-18

Coaxial counter-rotating rotor system

#65
20150360771
2015-12-17

Fly by wire servos with internal loop closure

#66
20150298796
2015-10-22

Aircraft hydraulic system comprising at least one servo-control, and an associated rotor and aircraft

#67
20150292527
2015-10-15

Pressure-balance valve for balancing fluid feed to actuator cylinders of a servo-control for controlling rotor blades of a rotorcraft

#68
20150267762
2015-09-24

Magnetorheological flight control clutch system

#69
20150232177
2015-08-20

Fly by wire servos with internal loop closure

#70
20150217866
2015-08-06

Magnetorheological rotorcraft actuator

#71
20150217865
2015-08-06

Magnetorheological rotorcraft actuation system

#72
20150176612
2015-06-25

Double hydraulic valve of a servo-control for feathering the blades of a rotorcraft rotor

#73
20150001337
2015-01-01

Independent hydraulic control system for rotorcraft secondary rotor

#74
20140345699
2014-11-27

Vent valve

#75
20140271201
2014-09-18

Jam-tolerant linear control motor for hydraulic actuator valve

#76
20140234102
2014-08-21

Radial fluid device with variable phase and amplitude

#77
20140231579
2014-08-21

Radial fluid device with multi-harmonic output

#78
20140027564
2014-01-30

Rotorcraft autopilot and methods

#79
20130214087
2013-08-22

Coaxial counter-rotating rotor system

#80
20130168501
2013-07-04

Primary flight controls

#81
20120282090
2012-11-08

Hydraulic cyclic blade speed control apparatus and method

#82
20110186691
2011-08-04

Aircraft

#83
20100089053
2010-04-15

HYBRID ELECTROMECHANICAL/HYDRO-MECHANICAL ACTUATION CONTROL SYSTEM

#84
20080304967
2008-12-11

Actuation system, helicopter using the same, and controlling method therefor

#85
20050147495
2005-07-07

Rotor as well as rotary-wing aircraft with a rotor

#86
20050008490
2005-01-13

Main rotor shaft mounted hydraulic pressure system

#87
17657948
2024-01-09

Helicopter with coaxial counter-rotating roller driven rotors

#88
17644755
2022-04-05

Helicopter with coaxial counter-rotating annular electric motor rotors