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CPC Subgroup
B64C 27/22

Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft

Full Title

Rotorcraft; Rotors peculiar thereto > Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft

4 direct subcodes

Child Classifications

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  • B64C 27/24 with rotor blades fixed in flight to act as lifting surfaces
  • B64C 27/26 characterised by provision of fixed wings
  • B64C 27/28 with forward-propulsion propellers pivotable to act as lifting rotors
  • B64C 27/30 with provision for reducing drag of inoperative rotor

Top Applicants

Top 10 applicants by patent filingsfor 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