CPC Subgroup
B64D 37/14 Filling or emptying (transferring fuels to adjust aircraft trim B64C17/10)
Full Title
Arrangements in connection with fuel supply for power plant (refuelling during flight B64D39/00) > Tanks (tanks constructed integrally with aircraft wings B64C3/34) > Filling or emptying (transferring fuels to adjust aircraft trim B64C17/10)
2 direct subcodes
Child Classifications
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- B64D 37/16 Filling systems (ground installations for fuelling aircraft B64F1/28)
- B64D 37/20 Emptying systems
Top Applicants
Top 10 applicants by patent filingsfor 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