IPC Main Group
B64C 21/00 Influencing air flow over aircraft surfaces by affecting boundary layer flow
Introduced: September 1968
Last revised: January 2023
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- AIRCRAFT; AVIATION; COSMONAUTICS
- Subclass:
- AEROPLANES; HELICOPTERS
3 direct subcodes
Child Classifications
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- B64C 21/01 Boundary layer ingestion [BLI] propulsion
- B64C 21/02 by use of slot, ducts, porous areas or the like
- B64C 21/1 using other surface properties, e.g. roughness
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