IPC Subgroup
B64C 27/59 mechanical
Introduced: January 1980
Last revised: January 2006
Full Title
Rotorcraft; Rotors peculiar thereto > Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement > Transmitting means, e.g. interrelated with initiating means or means acting on blades > mechanical
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- AIRCRAFT; AVIATION; COSMONAUTICS
- Subclass:
- AEROPLANES; HELICOPTERS
4 direct subcodes
Child Classifications
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- B64C 27/605 including swash plate, spider or cam mechanisms
- B64C 27/615 including flaps mounted on blades
- B64C 27/625 including rotating masses or servo rotors
- B64C 27/635 specially for controlling lag-lead movements of blades
Top Applicants
Top 10 applicants by patent filingsfor 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