DIFF Subgroup
B64C 27/56 characterised by the control initiating means, e.g. manually actuated
Introduced: September 1968
Full Title
Rotorcraft; Rotors peculiar thereto > Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement > characterised by the control initiating means, e.g. manually actuated
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- B64C 27/57 automatic or condition responsive, e.g. responsive to rotor speed, torque or thrust since 1980 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class B64,2013–2023, worldwide · Source: EPO PATSTAT
- BOEING COMPANY US 8,583
- AIRBUS OPERATIONS DE 3,430
- AIRBUS OPERATIONS FR 2,757
- HAMILTON SUNDSTRAND US 2,332
- SZ DJI TECHNOLOGY COMPANY CN 2,109
- AIRBUS OPERATIONS GB 2,084
- GOODRICH CORPORATION US 2,053
- XI'AN AIRCRAFT DESIGN INSTITUTE OF AVIATION INDUSTRY CORPORATION OF CHINA 1,938
- BOEING COMPANY 1,816
- NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS 1,589
Top Applicants (CPC)
Class B64,2013–2023, worldwide · Source: EPO PATSTAT
- BOEING COMPANY US 9,861
- AIRBUS OPERATIONS DE 3,766
- AIRBUS OPERATIONS FR 3,112
- SZ DJI TECHNOLOGY COMPANY CN 2,840
- HAMILTON SUNDSTRAND US 2,753
- GOODRICH CORPORATION US 2,427
- AIRBUS OPERATIONS GB 2,356
- BOEING COMPANY 2,057
- SAFRAN AIRCRAFT ENGINES FR 1,815
- AIRBUS OPERATIONS 1,723