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DIFF Subgroup
B64C 27/635

specially for controlling lag-lead movements of blades

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

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 > specially for controlling lag-lead movements of blades

CPC:

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 (means acting on blades B64C27/72) > mechanical > specially for controlling lag-lead movements of blades

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class B64,2013–2023, worldwide · Source: EPO PATSTAT

  1. BOEING COMPANY US 8,583
  2. AIRBUS OPERATIONS DE 3,430
  3. AIRBUS OPERATIONS FR 2,757
  4. HAMILTON SUNDSTRAND US 2,332
  5. SZ DJI TECHNOLOGY COMPANY CN 2,109
  6. AIRBUS OPERATIONS GB 2,084
  7. GOODRICH CORPORATION US 2,053
  8. XI'AN AIRCRAFT DESIGN INSTITUTE OF AVIATION INDUSTRY CORPORATION OF CHINA 1,938
  9. BOEING COMPANY 1,816
  10. NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS 1,589

Top Applicants (CPC)

Class B64,2013–2023, worldwide · Source: EPO PATSTAT

  1. BOEING COMPANY US 9,861
  2. AIRBUS OPERATIONS DE 3,766
  3. AIRBUS OPERATIONS FR 3,112
  4. SZ DJI TECHNOLOGY COMPANY CN 2,840
  5. HAMILTON SUNDSTRAND US 2,753
  6. GOODRICH CORPORATION US 2,427
  7. AIRBUS OPERATIONS GB 2,356
  8. BOEING COMPANY 2,057
  9. SAFRAN AIRCRAFT ENGINES FR 1,815
  10. AIRBUS OPERATIONS 1,723